Frankly because it sucks. Always thinking I just hit something coming out of the garage as it engages ..it isnt smooth stop , just to harsh. I prefer being able to creep back or forwards .
Let's not forget lack of OPD?OMG, 2 switches for 4 windows?
I do this regularly on my 2021 AWD. I can stop, resume travel, switch to reverse without triggering it.There are reports here that one can bring the car to a full stop before the autohold triggers and even stop it without triggering.