diff --git a/keyboards/40percentclub/ut47/matrix.c b/keyboards/40percentclub/ut47/matrix.c
index e47c7f8e13..c1284535bc 100644
--- a/keyboards/40percentclub/ut47/matrix.c
+++ b/keyboards/40percentclub/ut47/matrix.c
@@ -104,12 +104,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void)
-{
-    if (debouncing) return false;
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/ai03/orbit/matrix.c b/keyboards/ai03/orbit/matrix.c
index b8e3296686..024233524c 100644
--- a/keyboards/ai03/orbit/matrix.c
+++ b/keyboards/ai03/orbit/matrix.c
@@ -83,11 +83,6 @@ inline uint8_t matrix_rows(void) { return MATRIX_ROWS; }
 
 inline uint8_t matrix_cols(void) { return MATRIX_COLS; }
 
-bool matrix_is_modified(void) {
-  if (debounce_active()) return false;
-  return true;
-}
-
 inline bool matrix_is_on(uint8_t row, uint8_t col) { return (matrix[row] & ((matrix_row_t)1 << col)); }
 
 inline matrix_row_t matrix_get_row(uint8_t row) { return matrix[row]; }
diff --git a/keyboards/amj96/matrix.c b/keyboards/amj96/matrix.c
index 8e7bbaa791..ffd66d120f 100644
--- a/keyboards/amj96/matrix.c
+++ b/keyboards/amj96/matrix.c
@@ -108,12 +108,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void)
-{
-    if (debouncing) return false;
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/angel64/alpha/matrix.c b/keyboards/angel64/alpha/matrix.c
index 474fbec030..2851859cf2 100644
--- a/keyboards/angel64/alpha/matrix.c
+++ b/keyboards/angel64/alpha/matrix.c
@@ -90,13 +90,6 @@ uint8_t matrix_cols(void) {
     return MATRIX_COLS;
 }
 
-//Deprecated.
-bool matrix_is_modified(void)
-{
-    if (debounce_active()) return false;
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/angel64/rev1/matrix.c b/keyboards/angel64/rev1/matrix.c
index 474fbec030..2851859cf2 100644
--- a/keyboards/angel64/rev1/matrix.c
+++ b/keyboards/angel64/rev1/matrix.c
@@ -90,13 +90,6 @@ uint8_t matrix_cols(void) {
     return MATRIX_COLS;
 }
 
-//Deprecated.
-bool matrix_is_modified(void)
-{
-    if (debounce_active()) return false;
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/bpiphany/kitten_paw/matrix.c b/keyboards/bpiphany/kitten_paw/matrix.c
index b59089cdf4..56114858f1 100644
--- a/keyboards/bpiphany/kitten_paw/matrix.c
+++ b/keyboards/bpiphany/kitten_paw/matrix.c
@@ -117,13 +117,6 @@ uint8_t matrix_scan(void) {
   return 1;
 }
 
-bool matrix_is_modified(void) {
-  if (debouncing)
-    return false;
-  else
-    return true;
-}
-
 inline bool matrix_is_on(uint8_t row, uint8_t col) {
   return (matrix[row] & ((matrix_row_t)1<<col));
 }
diff --git a/keyboards/bpiphany/pegasushoof/2013/matrix.c b/keyboards/bpiphany/pegasushoof/2013/matrix.c
index 037f323c00..09244982d9 100644
--- a/keyboards/bpiphany/pegasushoof/2013/matrix.c
+++ b/keyboards/bpiphany/pegasushoof/2013/matrix.c
@@ -110,13 +110,6 @@ uint8_t matrix_scan(void)
 	return 1;
 }
 
-bool matrix_is_modified(void)
-{
-	if (debouncing)
-		return false;
-	return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/converter/palm_usb/matrix.c b/keyboards/converter/palm_usb/matrix.c
index 289284b616..5cb3c23572 100644
--- a/keyboards/converter/palm_usb/matrix.c
+++ b/keyboards/converter/palm_usb/matrix.c
@@ -58,8 +58,6 @@ static uint16_t disconnect_counter = 0;
 #define COL(code)    ((code & COL_MASK) )
 #define KEYUP(code) ((code & KEY_MASK) >>7 )
 
-static bool is_modified = false;
-
 __attribute__ ((weak))
 void matrix_init_kb(void) {
     matrix_init_user();
@@ -354,11 +352,6 @@ uint8_t matrix_scan(void)
     return code;
 }
 
-bool matrix_is_modified(void)
-{
-    return is_modified;
-}
-
 inline
 bool matrix_has_ghost(void)
 {
diff --git a/keyboards/converter/sun_usb/matrix.c b/keyboards/converter/sun_usb/matrix.c
index 21f45111ec..9ab34bcef7 100644
--- a/keyboards/converter/sun_usb/matrix.c
+++ b/keyboards/converter/sun_usb/matrix.c
@@ -38,8 +38,6 @@ static uint8_t matrix[MATRIX_ROWS];
 #define ROW(code)      ((code>>3)&0xF)
 #define COL(code)      (code&0x07)
 
-static bool is_modified = false;
-
 __attribute__ ((weak))
 void matrix_init_kb(void) {
     matrix_init_user();
@@ -154,11 +152,6 @@ uint8_t matrix_scan(void)
     return code;
 }
 
-bool matrix_is_modified(void)
-{
-    return is_modified;
-}
-
 inline
 bool matrix_has_ghost(void)
 {
diff --git a/keyboards/converter/usb_usb/custom_matrix.cpp b/keyboards/converter/usb_usb/custom_matrix.cpp
index 296f7fcd02..91986f6eb9 100644
--- a/keyboards/converter/usb_usb/custom_matrix.cpp
+++ b/keyboards/converter/usb_usb/custom_matrix.cpp
@@ -192,10 +192,6 @@ extern "C"
         return 1;
     }
 
-    bool matrix_is_modified(void) {
-        return matrix_is_mod;
-    }
-
     bool matrix_is_on(uint8_t row, uint8_t col) {
         uint8_t code = CODE(row, col);
 
diff --git a/keyboards/dc01/arrow/matrix.c b/keyboards/dc01/arrow/matrix.c
index 0102ad0fa4..b69e147914 100644
--- a/keyboards/dc01/arrow/matrix.c
+++ b/keyboards/dc01/arrow/matrix.c
@@ -205,14 +205,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void)
-{
-#if (DEBOUNCE > 0)
-    if (debouncing) return false;
-#endif
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/dc01/left/matrix.c b/keyboards/dc01/left/matrix.c
index bf5aba8497..084978a1fd 100644
--- a/keyboards/dc01/left/matrix.c
+++ b/keyboards/dc01/left/matrix.c
@@ -230,14 +230,6 @@ if (i2c_transaction(SLAVE_I2C_ADDRESS_NUMPAD, 0x1FFFF, 11)) {
     return 1;
 }
 
-bool matrix_is_modified(void)
-{
-#if (DEBOUNCE > 0)
-    if (debouncing) return false;
-#endif
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/dc01/numpad/matrix.c b/keyboards/dc01/numpad/matrix.c
index 38130114eb..e8e2a1b14a 100644
--- a/keyboards/dc01/numpad/matrix.c
+++ b/keyboards/dc01/numpad/matrix.c
@@ -205,14 +205,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void)
-{
-#if (DEBOUNCE > 0)
-    if (debouncing) return false;
-#endif
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/dc01/right/matrix.c b/keyboards/dc01/right/matrix.c
index 544c8dc538..2509bd7d4c 100644
--- a/keyboards/dc01/right/matrix.c
+++ b/keyboards/dc01/right/matrix.c
@@ -206,14 +206,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void)
-{
-#if (DEBOUNCE > 0)
-    if (debouncing) return false;
-#endif
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/dm9records/ergoinu/matrix.c b/keyboards/dm9records/ergoinu/matrix.c
index b1c58f88fe..87a5817313 100644
--- a/keyboards/dm9records/ergoinu/matrix.c
+++ b/keyboards/dm9records/ergoinu/matrix.c
@@ -223,12 +223,6 @@ void matrix_slave_scan(void) {
   }
 }
 
-bool matrix_is_modified(void)
-{
-  if (debouncing) return false;
-  return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/duck/jetfire/matrix.c b/keyboards/duck/jetfire/matrix.c
index 2dd94a72ac..729fa6dd14 100644
--- a/keyboards/duck/jetfire/matrix.c
+++ b/keyboards/duck/jetfire/matrix.c
@@ -116,12 +116,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void)
-{
-    if (debouncing) return false;
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/ergodox_stm32/matrix.c b/keyboards/ergodox_stm32/matrix.c
index 383bf9790a..094d4a9e0f 100644
--- a/keyboards/ergodox_stm32/matrix.c
+++ b/keyboards/ergodox_stm32/matrix.c
@@ -119,10 +119,6 @@ uint8_t matrix_scan(void) {
   return 0;
 }
 
-bool matrix_is_modified(void) {
-  return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col) {
   return (matrix[row] & (1 << col));
diff --git a/keyboards/ergotaco/matrix.c b/keyboards/ergotaco/matrix.c
index e5af1c27fd..16300a7e4f 100644
--- a/keyboards/ergotaco/matrix.c
+++ b/keyboards/ergotaco/matrix.c
@@ -199,11 +199,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void) // deprecated and evidently not called.
-{
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/gboards/gergoplex/matrix.c b/keyboards/gboards/gergoplex/matrix.c
index 716390241a..a075b85725 100644
--- a/keyboards/gboards/gergoplex/matrix.c
+++ b/keyboards/gboards/gergoplex/matrix.c
@@ -152,11 +152,6 @@ uint8_t matrix_scan(void) {
     return 1;
 }
 
-bool matrix_is_modified(void)  // deprecated and evidently not called.
-{
-    return true;
-}
-
 inline bool         matrix_is_on(uint8_t row, uint8_t col) { return (matrix[row] & ((matrix_row_t)1 << col)); }
 inline matrix_row_t matrix_get_row(uint8_t row) { return matrix[row]; }
 
diff --git a/keyboards/georgi/matrix.c b/keyboards/georgi/matrix.c
index 438412102b..7d635ad8d7 100644
--- a/keyboards/georgi/matrix.c
+++ b/keyboards/georgi/matrix.c
@@ -220,11 +220,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void) // deprecated and evidently not called.
-{
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/gergo/matrix.c b/keyboards/gergo/matrix.c
index 655e729356..443e97132b 100644
--- a/keyboards/gergo/matrix.c
+++ b/keyboards/gergo/matrix.c
@@ -273,11 +273,6 @@ uint8_t matrix_scan(void) {
     return 1;
 }
 
-bool matrix_is_modified(void) // deprecated and evidently not called.
-{
-    return true;
-}
-
 inline bool matrix_is_on(uint8_t row, uint8_t col) { return (matrix[row] & ((matrix_row_t)1 << col)); }
 
 inline matrix_row_t matrix_get_row(uint8_t row) { return matrix[row]; }
diff --git a/keyboards/handwired/dactyl/matrix.c b/keyboards/handwired/dactyl/matrix.c
index a21cd08e14..a70e8c5aca 100644
--- a/keyboards/handwired/dactyl/matrix.c
+++ b/keyboards/handwired/dactyl/matrix.c
@@ -281,14 +281,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void) // deprecated and evidently not called.
-{
-#if (DEBOUNCE > 0)
-    if (debouncing) return false;
-#endif
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/handwired/frenchdev/matrix.c b/keyboards/handwired/frenchdev/matrix.c
index 5ab254a6f9..a043f78538 100644
--- a/keyboards/handwired/frenchdev/matrix.c
+++ b/keyboards/handwired/frenchdev/matrix.c
@@ -174,12 +174,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void)
-{
-    if (debouncing) return false;
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/handwired/not_so_minidox/matrix.c b/keyboards/handwired/not_so_minidox/matrix.c
index b7cec9370c..d2bbf7d303 100644
--- a/keyboards/handwired/not_so_minidox/matrix.c
+++ b/keyboards/handwired/not_so_minidox/matrix.c
@@ -239,12 +239,6 @@ void matrix_slave_scan(void) {
 #endif
 }
 
-bool matrix_is_modified(void)
-{
-    if (debouncing) return false;
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/handwired/promethium/matrix.c b/keyboards/handwired/promethium/matrix.c
index e3a41af288..90dbce14a9 100644
--- a/keyboards/handwired/promethium/matrix.c
+++ b/keyboards/handwired/promethium/matrix.c
@@ -148,14 +148,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void)
-{
-#if (DEBOUNCE > 0)
-    if (debouncing) return false;
-#endif
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 
diff --git a/keyboards/handwired/pterodactyl/matrix.c b/keyboards/handwired/pterodactyl/matrix.c
index 21e6a128df..d0f74802a0 100644
--- a/keyboards/handwired/pterodactyl/matrix.c
+++ b/keyboards/handwired/pterodactyl/matrix.c
@@ -282,14 +282,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void) // deprecated and evidently not called.
-{
-#if (DEBOUNCE > 0)
-    if (debouncing) return false;
-#endif
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/helix/pico/matrix.c b/keyboards/helix/pico/matrix.c
index b18213d846..039cca6dcf 100644
--- a/keyboards/helix/pico/matrix.c
+++ b/keyboards/helix/pico/matrix.c
@@ -273,12 +273,6 @@ void matrix_slave_scan(void) {
 #endif
 }
 
-bool matrix_is_modified(void)
-{
-    if (debouncing) return false;
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/helix/rev1/matrix.c b/keyboards/helix/rev1/matrix.c
index aa2cc76905..f59391b596 100644
--- a/keyboards/helix/rev1/matrix.c
+++ b/keyboards/helix/rev1/matrix.c
@@ -239,12 +239,6 @@ void matrix_slave_scan(void) {
 #endif
 }
 
-bool matrix_is_modified(void)
-{
-    if (debouncing) return false;
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/helix/rev2/matrix.c b/keyboards/helix/rev2/matrix.c
index 8eed7e58b7..699c15358b 100644
--- a/keyboards/helix/rev2/matrix.c
+++ b/keyboards/helix/rev2/matrix.c
@@ -287,12 +287,6 @@ void matrix_slave_scan(void) {
 #endif
 }
 
-bool matrix_is_modified(void)
-{
-    if (debouncing) return false;
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/hhkb/ansi/matrix.c b/keyboards/hhkb/ansi/matrix.c
index 529ba8b8fc..5dde74cce9 100644
--- a/keyboards/hhkb/ansi/matrix.c
+++ b/keyboards/hhkb/ansi/matrix.c
@@ -163,15 +163,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void)
-{
-    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
-        if (matrix[i] != matrix_prev[i])
-            return true;
-    }
-    return false;
-}
-
 inline
 bool matrix_has_ghost(void)
 {
diff --git a/keyboards/hhkb/jp/matrix.c b/keyboards/hhkb/jp/matrix.c
index c0dca6a990..81db77fca7 100644
--- a/keyboards/hhkb/jp/matrix.c
+++ b/keyboards/hhkb/jp/matrix.c
@@ -164,15 +164,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void)
-{
-    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
-        if (matrix[i] != matrix_prev[i])
-            return true;
-    }
-    return false;
-}
-
 inline
 bool matrix_has_ghost(void)
 {
diff --git a/keyboards/hid_liber/matrix.c b/keyboards/hid_liber/matrix.c
index ff59a17153..da73c616d7 100755
--- a/keyboards/hid_liber/matrix.c
+++ b/keyboards/hid_liber/matrix.c
@@ -218,12 +218,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void)
-{
-    // NOTE: no longer used
-    return true;
-}
-
 inline
 bool matrix_has_ghost(void)
 {
diff --git a/keyboards/kinesis/alvicstep/matrix.c b/keyboards/kinesis/alvicstep/matrix.c
index 71619f8167..9c05374510 100644
--- a/keyboards/kinesis/alvicstep/matrix.c
+++ b/keyboards/kinesis/alvicstep/matrix.c
@@ -136,12 +136,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void)
-{
-    if (debouncing) return false;
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/meira/matrix.c b/keyboards/meira/matrix.c
index ae1ae5ce9d..8e8e9485b4 100644
--- a/keyboards/meira/matrix.c
+++ b/keyboards/meira/matrix.c
@@ -161,12 +161,6 @@ uint8_t matrix_scan(void)
 	return ret;
 }
 
-bool matrix_is_modified(void)
-{
-    if (debouncing) return false;
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/nek_type_a/matrix.c b/keyboards/nek_type_a/matrix.c
index a59598a503..b396be9911 100644
--- a/keyboards/nek_type_a/matrix.c
+++ b/keyboards/nek_type_a/matrix.c
@@ -205,14 +205,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void)
-{
-#if (DEBOUNCE > 0)
-    if (debouncing) return false;
-#endif
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/redscarf_iiplus/verb/matrix.c b/keyboards/redscarf_iiplus/verb/matrix.c
index 42cfb7c037..88ecb586b3 100755
--- a/keyboards/redscarf_iiplus/verb/matrix.c
+++ b/keyboards/redscarf_iiplus/verb/matrix.c
@@ -94,13 +94,6 @@ uint8_t matrix_cols(void) {
     return MATRIX_COLS;
 }
 
-//Deprecated.
-bool matrix_is_modified(void)
-{
-    if (debounce_active()) return false;
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/redscarf_iiplus/verc/matrix.c b/keyboards/redscarf_iiplus/verc/matrix.c
index 42cfb7c037..88ecb586b3 100755
--- a/keyboards/redscarf_iiplus/verc/matrix.c
+++ b/keyboards/redscarf_iiplus/verc/matrix.c
@@ -94,13 +94,6 @@ uint8_t matrix_cols(void) {
     return MATRIX_COLS;
 }
 
-//Deprecated.
-bool matrix_is_modified(void)
-{
-    if (debounce_active()) return false;
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/redscarf_iiplus/verd/matrix.c b/keyboards/redscarf_iiplus/verd/matrix.c
index 78d1191b68..d9dbb3c0a3 100644
--- a/keyboards/redscarf_iiplus/verd/matrix.c
+++ b/keyboards/redscarf_iiplus/verd/matrix.c
@@ -94,13 +94,6 @@ uint8_t matrix_cols(void) {
     return MATRIX_COLS;
 }
 
-//Deprecated.
-bool matrix_is_modified(void)
-{
-    if (debounce_active()) return false;
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/sirius/unigo66/custom_matrix.cpp b/keyboards/sirius/unigo66/custom_matrix.cpp
index fba107c7cb..dfcf82c779 100644
--- a/keyboards/sirius/unigo66/custom_matrix.cpp
+++ b/keyboards/sirius/unigo66/custom_matrix.cpp
@@ -172,10 +172,6 @@ extern "C"
         return 1;
     }
 
-    bool matrix_is_modified(void) {
-        return matrix_is_mod;
-    }
-
     bool matrix_is_on(uint8_t row, uint8_t col) {
         uint8_t code = CODE(row, col);
 
diff --git a/keyboards/sixkeyboard/matrix.c b/keyboards/sixkeyboard/matrix.c
index 64b46e9b0c..a6b28f3a12 100644
--- a/keyboards/sixkeyboard/matrix.c
+++ b/keyboards/sixkeyboard/matrix.c
@@ -114,11 +114,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void)
-{
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/sx60/matrix.c b/keyboards/sx60/matrix.c
index b7dc25425d..231e1c8836 100644
--- a/keyboards/sx60/matrix.c
+++ b/keyboards/sx60/matrix.c
@@ -172,14 +172,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void)
-{
-#if (DEBOUNCE > 0)
-    if (debouncing) return false;
-#endif
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/thedogkeyboard/matrix.c b/keyboards/thedogkeyboard/matrix.c
index 474fbec030..2851859cf2 100644
--- a/keyboards/thedogkeyboard/matrix.c
+++ b/keyboards/thedogkeyboard/matrix.c
@@ -90,13 +90,6 @@ uint8_t matrix_cols(void) {
     return MATRIX_COLS;
 }
 
-//Deprecated.
-bool matrix_is_modified(void)
-{
-    if (debounce_active()) return false;
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/keyboards/yosino58/rev1/matrix.c b/keyboards/yosino58/rev1/matrix.c
index 3db40b3829..e2be7113bf 100644
--- a/keyboards/yosino58/rev1/matrix.c
+++ b/keyboards/yosino58/rev1/matrix.c
@@ -289,12 +289,6 @@ void matrix_slave_scan(void) {
 #endif
 }
 
-bool matrix_is_modified(void)
-{
-    if (debouncing) return false;
-    return true;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
diff --git a/quantum/debounce.h b/quantum/debounce.h
index 5043868289..3532d9cd7b 100644
--- a/quantum/debounce.h
+++ b/quantum/debounce.h
@@ -6,8 +6,6 @@
 // changed is true if raw has changed since the last call
 void debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed);
 
-bool debounce_active(void);
-
 void debounce_init(uint8_t num_rows);
 
 void debounce_free(void);
diff --git a/quantum/debounce/asym_eager_defer_pk.c b/quantum/debounce/asym_eager_defer_pk.c
index 81f39383c4..b1eb4a2b7b 100644
--- a/quantum/debounce/asym_eager_defer_pk.c
+++ b/quantum/debounce/asym_eager_defer_pk.c
@@ -165,7 +165,6 @@ static void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], ui
     }
 }
 
-bool debounce_active(void) { return true; }
 #else
 #    include "none.c"
 #endif
diff --git a/quantum/debounce/none.c b/quantum/debounce/none.c
index b03892bc5b..8a85cc04a8 100644
--- a/quantum/debounce/none.c
+++ b/quantum/debounce/none.c
@@ -26,6 +26,4 @@ void debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool
     }
 }
 
-bool debounce_active(void) { return false; }
-
 void debounce_free(void) {}
diff --git a/quantum/debounce/sym_defer_g.c b/quantum/debounce/sym_defer_g.c
index 9155eb914c..8cac1c37f9 100644
--- a/quantum/debounce/sym_defer_g.c
+++ b/quantum/debounce/sym_defer_g.c
@@ -44,8 +44,6 @@ void debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool
     }
 }
 
-bool debounce_active(void) { return debouncing; }
-
 void debounce_free(void) {}
 #else  // no debouncing.
 #    include "none.c"
diff --git a/quantum/debounce/sym_defer_pk.c b/quantum/debounce/sym_defer_pk.c
index 1b698ba347..9dee29e28e 100644
--- a/quantum/debounce/sym_defer_pk.c
+++ b/quantum/debounce/sym_defer_pk.c
@@ -134,7 +134,6 @@ static void start_debounce_counters(matrix_row_t raw[], matrix_row_t cooked[], u
     }
 }
 
-bool debounce_active(void) { return true; }
 #else
 #    include "none.c"
 #endif
diff --git a/quantum/debounce/sym_eager_pk.c b/quantum/debounce/sym_eager_pk.c
index 9da000ea9a..deec463649 100644
--- a/quantum/debounce/sym_eager_pk.c
+++ b/quantum/debounce/sym_eager_pk.c
@@ -140,7 +140,6 @@ static void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], ui
     }
 }
 
-bool debounce_active(void) { return true; }
 #else
 #    include "none.c"
 #endif
diff --git a/quantum/debounce/sym_eager_pr.c b/quantum/debounce/sym_eager_pr.c
index eda92a263b..29b0cabefb 100644
--- a/quantum/debounce/sym_eager_pr.c
+++ b/quantum/debounce/sym_eager_pr.c
@@ -132,7 +132,6 @@ static void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], ui
     }
 }
 
-bool debounce_active(void) { return true; }
 #else
 #    include "none.c"
 #endif
diff --git a/quantum/matrix.h b/quantum/matrix.h
index 5c696622fc..1a3f362fba 100644
--- a/quantum/matrix.h
+++ b/quantum/matrix.h
@@ -46,8 +46,6 @@ void matrix_setup(void);
 void matrix_init(void);
 /* scan all key states on matrix */
 uint8_t matrix_scan(void);
-/* whether modified from previous scan. used after matrix_scan. */
-bool matrix_is_modified(void) __attribute__((deprecated));
 /* whether a switch is on */
 bool matrix_is_on(uint8_t row, uint8_t col);
 /* matrix state on row */
diff --git a/quantum/matrix_common.c b/quantum/matrix_common.c
index 66c89970b1..fe1d5b1edd 100644
--- a/quantum/matrix_common.c
+++ b/quantum/matrix_common.c
@@ -45,12 +45,6 @@ inline matrix_row_t matrix_get_row(uint8_t row) {
 #endif
 }
 
-// Deprecated.
-bool matrix_is_modified(void) {
-    if (debounce_active()) return false;
-    return true;
-}
-
 #if (MATRIX_COLS <= 8)
 #    define print_matrix_header() print("\nr/c 01234567\n")
 #    define print_matrix_row(row) print_bin_reverse8(matrix_get_row(row))