I think their issue was not having control over when they leave the vehicle. If the locks are computer controlled, there's risk of a false alarm preventing your exit, potentially in an emergency.

I agree that this is better left to a warning indicator.

Yep, that's exactly my issue. Warning light is fine, lockout is not. Too many situations in which a lockout would be dangerous - false positives/failure of the system locking me into the car, carjackers taking advantage of it by parking a bike behind me, etc.