> Cars these days are governed by hundreds of computers

That's an exaggeration. There is no car out there that has "hundreds of computers" in it, unless you take an extremely loose definition of "computer" that is something like "a chip with transistors in it". I think any reasonable definition of a computer involves being reprogrammable (even if only with in-depth servicing), and I don't think you'll find hundreds of devices in a car that meet that definition.