so why does it matter ?
a computer to run a radio, CD, MP3 player ? Seriously ? what is gained other than complexity, cost and dependencies ? Bad enough waiting for a TV to load its OS then display something. Slower than the old valve analogues with their warmup times.
I think the 50 year old slightly weathered car down back is looking more like a restoration goal every month. Serviceable, no entertainment dependencies, no heating or cooling dependencies. The one change is a CDI addtion, with a CDI that I can repair and keep a few spares. (capacitors, BUX80 and so on)
As for for the thought of a complex OS doing anything in a car, agree with previous. Bring on the QNX and leave everything else mechanical. Once can disassemble most switches and do a refurb if replacements not available, unlike a block of plastic with wires sticking out. You know, save the planet, stop waste, cut pollution by industrial waste etc