> If cars (the non-software parts) were made like this, there would be millions of them breaking down by the side of the road daily.

Well, cars did break down by the side of the road daily! That's why it used to be good advice even in the 90s to always have a basic set of tools in your trunk, why AAA offered roadside assistance already in 1915, and why part of the European CDL is enough basic mechanic knowledge to self-help when the truck breaks down.

It's only in the last 20-ish years that "smarts" became cheap and ubiquitous enough in cars that the car can warn preemptively. And additionally, regulatory requirements on quality, parts availability and public expectations went up, exerting competitive pressure.