The treads are the weakest part of a tank, sort of. So the thing is when you lose a tread the track snaps and gets tangled and fouled and you can't move.
All the running wheels on one side don't simply pop off and disappear, as they're usually made of 4-inch thick steel or some such material.
I would like to have tanks lose their tracks and remain upright. This is more realistic and allows damage that immobilizes the vehicle but leaves it a viable threat.
