I don't think it makes much difference what the failure is if the end result is that you can't sensibly drive the car.

If the display fails in a Tesla Model 3, for example, then that's a critical failure because you lose all dashboard information. In contrast, if the display failed in my car then I'd lose access to some features (like sat nav and the reversing camera) but I can otherwise safely drive the car.

If you can't drive the car safely then it doesn't matter how good the drivetrain is. You still need to fix the problem to make the car drivable.