If losing cellular service causes it to stop, then in emergencies you're pretty much guaranteeing a large number of roadblocks for emergency services, on top of their existing hazards to emergency services when operating in ideal environments.
> Should the car keep going when it is not confident to do so?
See above, re: if your car can't even pull over and park safely on its own it has no business being on the street.
Key word here being “supposed to”, of course problems occur all the time. Also once a car gets stuck, pulling over is hard because… it’s stuck.
"Yeah but hiring people for our beta testing costs -money-, how do you expect us to growth hack with that?"