diff --git a/Marlin/src/inc/Conditionals_post.h b/Marlin/src/inc/Conditionals_post.h
index cf6c560b5cc7..5c149cee89e1 100644
--- a/Marlin/src/inc/Conditionals_post.h
+++ b/Marlin/src/inc/Conditionals_post.h
@@ -190,22 +190,22 @@
   #define XY_CENTER { X_CENTER, Y_CENTER }
 #endif
 #if HAS_I_AXIS
-  #define I_CENTER TERN(BED_CENTER_AT_0_0, 0, _I_HALF_BED)
+  #define I_CENTER _I_HALF_BED
 #endif
 #if HAS_J_AXIS
-  #define J_CENTER TERN(BED_CENTER_AT_0_0, 0, _J_HALF_BED)
+  #define J_CENTER _J_HALF_BED
 #endif
 #if HAS_K_AXIS
-  #define K_CENTER TERN(BED_CENTER_AT_0_0, 0, _K_HALF_BED)
+  #define K_CENTER _K_HALF_BED
 #endif
 #if HAS_U_AXIS
-  #define U_CENTER TERN(BED_CENTER_AT_0_0, 0, _U_HALF_BED)
+  #define U_CENTER _U_HALF_BED
 #endif
 #if HAS_V_AXIS
-  #define V_CENTER TERN(BED_CENTER_AT_0_0, 0, _V_HALF_BED)
+  #define V_CENTER _V_HALF_BED
 #endif
 #if HAS_W_AXIS
-  #define W_CENTER TERN(BED_CENTER_AT_0_0, 0, _W_HALF_BED)
+  #define W_CENTER _W_HALF_BED
 #endif
 
 // Get the linear boundaries of the bed
diff --git a/Marlin/src/inc/SanityCheck.h b/Marlin/src/inc/SanityCheck.h
index dc8c8a22cc36..ec1c1a647578 100644
--- a/Marlin/src/inc/SanityCheck.h
+++ b/Marlin/src/inc/SanityCheck.h
@@ -1580,18 +1580,18 @@ static_assert(X_MAX_LENGTH >= X_BED_SIZE, "Movement bounds (X_MIN_POS, X_MAX_POS
 #endif
 
 /**
- * Features that require a min/max/specific NUM_AXES
+ * Features that require a min/max/specific steppers / axes to be enabled.
  */
 #if HAS_LEVELING && !HAS_Z_AXIS
   #error "Leveling in Marlin requires three or more axes, with Z as the vertical axis."
 #elif ENABLED(CNC_WORKSPACE_PLANES) && !HAS_Z_AXIS
-  #error "CNC_WORKSPACE_PLANES currently requires NUM_AXES >= 3"
+  #error "CNC_WORKSPACE_PLANES currently requires a Z axis"
 #elif ENABLED(DIRECT_STEPPING) && NUM_AXES > XYZ
-  #error "DIRECT_STEPPING currently requires NUM_AXES 3"
-#elif ENABLED(FOAMCUTTER_XYUV) && NUM_AXES < 5
-  #error "FOAMCUTTER_XYUV requires NUM_AXES >= 5."
+  #error "DIRECT_STEPPING does not currently support more than 3 axes (i.e., XYZ)."
+#elif ENABLED(FOAMCUTTER_XYUV) && !(HAS_I_AXIS && HAS_J_AXIS)
+  #error "FOAMCUTTER_XYUV requires I and J steppers to be enabled."
 #elif ENABLED(LINEAR_ADVANCE) && HAS_I_AXIS
-  #error "LINEAR_ADVANCE currently requires NUM_AXES <= 3."
+  #error "LINEAR_ADVANCE does not currently support the inclusion of an I axis."
 #endif
 
 /**
@@ -1599,11 +1599,13 @@ static_assert(X_MAX_LENGTH >= X_BED_SIZE, "Movement bounds (X_MIN_POS, X_MAX_POS
  */
 #if HAS_I_AXIS
   #if !defined(I_MIN_POS) || !defined(I_MAX_POS)
-    #error "I_MIN_POS and I_MAX_POS are required with NUM_AXES >= 4."
+    #error "I_MIN_POS and I_MAX_POS are required for the I axis."
   #elif !defined(I_HOME_DIR)
-    #error "I_HOME_DIR is required with NUM_AXES >= 4."
+    #error "I_HOME_DIR is required for the I axis."
   #elif HAS_I_ENABLE && !defined(I_ENABLE_ON)
-    #error "I_ENABLE_ON is required for your I driver with NUM_AXES >= 4."
+    #error "I_ENABLE_ON is required for the I stepper."
+  #elif !defined(INVERT_I_DIR)
+    #error "INVERT_I_DIR is required for the I stepper."
   #endif
 #endif
 #if HAS_J_AXIS
@@ -1612,11 +1614,13 @@ static_assert(X_MAX_LENGTH >= X_BED_SIZE, "Movement bounds (X_MIN_POS, X_MAX_POS
   #elif ENABLED(AXIS5_ROTATES) && DISABLED(AXIS4_ROTATES)
     #error "AXIS5_ROTATES requires AXIS4_ROTATES."
   #elif !defined(J_MIN_POS) || !defined(J_MAX_POS)
-    #error "J_MIN_POS and J_MAX_POS are required with NUM_AXES >= 5."
+    #error "J_MIN_POS and J_MAX_POS are required for the J axis."
   #elif !defined(J_HOME_DIR)
-    #error "J_HOME_DIR is required with NUM_AXES >= 5."
+    #error "J_HOME_DIR is required for the J axis."
   #elif HAS_J_ENABLE && !defined(J_ENABLE_ON)
-    #error "J_ENABLE_ON is required for your J driver with NUM_AXES >= 5."
+    #error "J_ENABLE_ON is required for the J stepper."
+  #elif !defined(INVERT_J_DIR)
+    #error "INVERT_J_DIR is required for the J stepper."
   #endif
 #endif
 #if HAS_K_AXIS
@@ -1625,11 +1629,13 @@ static_assert(X_MAX_LENGTH >= X_BED_SIZE, "Movement bounds (X_MIN_POS, X_MAX_POS
   #elif ENABLED(AXIS6_ROTATES) && DISABLED(AXIS5_ROTATES)
     #error "AXIS6_ROTATES requires AXIS5_ROTATES."
   #elif !defined(K_MIN_POS) || !defined(K_MAX_POS)
-    #error "K_MIN_POS and K_MAX_POS are required with NUM_AXES >= 6."
+    #error "K_MIN_POS and K_MAX_POS are required for the K axis."
   #elif !defined(K_HOME_DIR)
-    #error "K_HOME_DIR is required with NUM_AXES >= 6."
+    #error "K_HOME_DIR is required for the K axis."
   #elif HAS_K_ENABLE && !defined(K_ENABLE_ON)
-    #error "K_ENABLE_ON is required for your K driver with NUM_AXES >= 6."
+    #error "K_ENABLE_ON is required for the K stepper."
+  #elif !defined(INVERT_K_DIR)
+    #error "INVERT_K_DIR is required for the K stepper."
   #endif
 #endif
 #if HAS_U_AXIS
@@ -1638,11 +1644,13 @@ static_assert(X_MAX_LENGTH >= X_BED_SIZE, "Movement bounds (X_MIN_POS, X_MAX_POS
   #elif ENABLED(AXIS7_ROTATES) && DISABLED(AXIS6_ROTATES)
     #error "AXIS7_ROTATES requires AXIS6_ROTATES."
   #elif !defined(U_MIN_POS) || !defined(U_MAX_POS)
-    #error "U_MIN_POS and U_MAX_POS are required with NUM_AXES >= 7."
+    #error "U_MIN_POS and U_MAX_POS are required for the U axis."
   #elif !defined(U_HOME_DIR)
-    #error "U_HOME_DIR is required with NUM_AXES >= 7."
+    #error "U_HOME_DIR is required for the U axis."
   #elif HAS_U_ENABLE && !defined(U_ENABLE_ON)
-    #error "U_ENABLE_ON is required for your U driver with NUM_AXES >= 7."
+    #error "U_ENABLE_ON is required for the U stepper."
+  #elif !defined(INVERT_U_DIR)
+    #error "INVERT_U_DIR is required for the U stepper."
   #endif
 #endif
 #if HAS_V_AXIS
@@ -1651,11 +1659,13 @@ static_assert(X_MAX_LENGTH >= X_BED_SIZE, "Movement bounds (X_MIN_POS, X_MAX_POS
   #elif ENABLED(AXIS8_ROTATES) && DISABLED(AXIS7_ROTATES)
     #error "AXIS8_ROTATES requires AXIS7_ROTATES."
   #elif !defined(V_MIN_POS) || !defined(V_MAX_POS)
-    #error "V_MIN_POS and V_MAX_POS are required with NUM_AXES >= 8."
+    #error "V_MIN_POS and V_MAX_POS are required for the V axis."
   #elif !defined(V_HOME_DIR)
-    #error "V_HOME_DIR is required with NUM_AXES >= 8."
+    #error "V_HOME_DIR is required for the V axis."
   #elif HAS_V_ENABLE && !defined(V_ENABLE_ON)
-    #error "V_ENABLE_ON is required for your V driver with NUM_AXES >= 8."
+    #error "V_ENABLE_ON is required for the V stepper."
+  #elif !defined(INVERT_V_DIR)
+    #error "INVERT_V_DIR is required for the V stepper."
   #endif
 #endif
 #if HAS_W_AXIS
@@ -1664,11 +1674,13 @@ static_assert(X_MAX_LENGTH >= X_BED_SIZE, "Movement bounds (X_MIN_POS, X_MAX_POS
   #elif ENABLED(AXIS9_ROTATES) && DISABLED(AXIS8_ROTATES)
     #error "AXIS9_ROTATES requires AXIS8_ROTATES."
   #elif !defined(W_MIN_POS) || !defined(W_MAX_POS)
-    #error "W_MIN_POS and W_MAX_POS are required with NUM_AXES >= 9."
+    #error "W_MIN_POS and W_MAX_POS are required for the W axis."
   #elif !defined(W_HOME_DIR)
-    #error "W_HOME_DIR is required with NUM_AXES >= 9."
+    #error "W_HOME_DIR is required for the W axis."
   #elif HAS_W_ENABLE && !defined(W_ENABLE_ON)
-    #error "W_ENABLE_ON is required for your W driver with NUM_AXES >= 9."
+    #error "W_ENABLE_ON is required for the W stepper."
+  #elif !defined(INVERT_W_DIR)
+    #error "INVERT_W_DIR is required for the W stepper."
   #endif
 #endif