Wait...i remember the wheel still fly off from the AI Cars on my PS4...I've heard some people say the cars accelerate slower (although I don't think they do). Handling felt no different when I first played it last year. But the damage is reduced e.g. When you hit an AI car head on on the highway the wheels don't fly off the AI cars anymore when they did on PS3.
Actually it still does but it happens less common...
Might be NFSW...
Also while the damage seems to be reduced massively (because of !st Person mode), i feel that the front end and rear end of the car damage a bit more easily but the whole middle part (cockpit, roof, doors...etc) is almost impossible to damage heavily...just some small bends and scratches...
Here's some ps4 damage...