How did this failure mode happen then? Even if the computer isn't monolithic, it seems that some failure higher in the stack can make the car into a brick. Doe

How did this failure mode happen then? Even if the computer isn't monolithic, it seems that some failure higher in the stack can make the car into a brick. Does the real control system depend on the infotainment system or other higher level systems for UI interaction? If so then that's basically the same thing.