Because it’s completely broken compared to driving on a keyboard or controller - try it, the cars/physics behave differently between those and a wheel.
They don’t have proper force feedback support. Drifting is way easier on forza 7 with a wheel because they let you customize your wheel settings with more detail. In fh4 I find drifting hard as the wheel doesn’t turn on its own as much and correcting under steer can be a pain. Its a shame they don’t have proper wheel support i was looking forward to using my logitech g920 but I’m far better with a controller.