🔧 Sanity-check DEFAULT_EJERK with LIN_ADVANCE

See #20649

Marlin/src/inc/SanityCheck.h

   );
   #if ENABLED(S_CURVE_ACCELERATION) && DISABLED(EXPERIMENTAL_SCURVE)
     #error "LIN_ADVANCE and S_CURVE_ACCELERATION may not play well together! Enable EXPERIMENTAL_SCURVE to continue."
+  #elif ENABLED(DIRECT_STEPPING)
+    #error "DIRECT_STEPPING is incompatible with LIN_ADVANCE. Enable in external planner if possible."
+  #elif !HAS_JUNCTION_DEVIATION && defined(DEFAULT_EJERK)
+    static_assert(DEFAULT_EJERK >= 10, "It is strongly recommended to set DEFAULT_EJERK >= 10 when using LIN_ADVANCE.");
   #endif
 #endif
 
 #endif
 
 /**
- * Stepper Chunk support
- */
-#if BOTH(DIRECT_STEPPING, LIN_ADVANCE)
-  #error "DIRECT_STEPPING is incompatible with LIN_ADVANCE. Enable in external planner if possible."
-#endif
-
-/**
  * Touch Screen Calibration
  */
 #if ENABLED(TFT_TOUCH_DEVICE_XPT2046) && DISABLED(TOUCH_SCREEN_CALIBRATION) \

Marlin/src/pins/lpc1768/pins_BTT_SKR_common.h

   #endif
 #endif
 
-
 #define ONBOARD_SD_CS_PIN                  P0_06  // Chip select for "System" SD card
 
 #if SD_CONNECTION_IS(LCD) && ENABLED(SKR_USE_LCD_SD_CARD_PINS_FOR_CS)
-  #error "SDCARD_CONNECTION must not be 'LCD' with SKR_USE_LCD_PINS_FOR_CS."
+  #error "SDCARD_CONNECTION must not be 'LCD' with SKR_USE_LCD_SD_CARD_PINS_FOR_CS."
 #endif
 
 #if SD_CONNECTION_IS(LCD)