Comment by Skwid

You break nothing much, don't worry - I was taking about equipment failure or malfunction, not targeted attack. Like, your power brakes or ABS can fail but you can still brake. Power steering can fail but you can still steer. Hell, steering wheel can pop right off and the steering geometry should still try to relatively prefer the center (not always ideal, but like, better than going fully insane like a shopping cart wheel). My point is there's no single CPU executing the entire vehicle where any malfunction can spontaneously cause the entire vehicle to stop functioning so badly that it won't perform any of its duties. Sure an ECU could fail and not run the engine, but that won't make you lose the ability to brake or steer if it happens in the middle of a highway. Something malicious can still command the rest of the vehicle to stop functioning one by one, but there aren't many single sources of that much failure.

At the very least, the system that maintains the temperature of the fridge (critical for food safety) should not be brought down by an exception in the system that displays advertisements on the front panel...