why we started adding computer operating systems to our vehicles to begin with.

Because fuel injection operates better than even the most high tech carburetors across a wider range of environments. And if you have more sensors and active feedback you can better control everything from emissions to warm up time. Everything trickles down from racing / luxury vehicles. Once you have processors involved, might as well do fancy things with them inside the cabin too.

A lot of the dash / center console nonsense is consumer cost cutting, but frankly it should’ve been separate from the start. Any budget phone is a better GPS / media platform than a half-baked system by a vehicle manufacturer. At this point it should just be a USB-C or bluetooth connection so the device without the bargain basement processor can do the heavy lifting for a user interface.