It turns out HIDAPI for Xbox controllers doesn't allow background input, so we won't enable it by default on Windows.

src/joystick/hidapi/SDL_hidapijoystick_c.h

@@ -34,6 +34,8 @@
 #ifdef __WINDOWS__
 /* On Windows, Xbox One controllers are handled by the Xbox 360 driver */
 #undef SDL_JOYSTICK_HIDAPI_XBOXONE
+/* It turns out HIDAPI for Xbox controllers doesn't allow background input */
+#undef SDL_JOYSTICK_HIDAPI_XBOX360
 #endif
 
 #ifdef __MACOSX__