The problem lies with the electric parking brakes. ..
Funny, in all the decades I've driven, I've never had a single incident with a mechanical parking brake. Neither the one in the middle between the seats, or the one on the floor.
Considering his smarts, it sure seems dumb for Musk to reinvent the wheel, especially for something the end user has no control over whether it works or not. As I have said many times before, there's a reason mechanical light switches are still around. They work every time.