Comment by ryandrake

As you alluded to, the answer is they don't care. Car companies look at software like it's any other line item on the BOM. Like a bolt or a gasket: Source it as cheaply as possible and spoon it onto the product somewhere on the assembly line. I see fit-and-polish mistakes all the time in car infotainment. Text that can't handle unicode, icons that are misaligned by 1 or more pixels, connections dropping and coming back, audio mixing problems, things drawing outside their "windows." Nobody cares--they get to the drop dead date when the software needs to be on the assembly line, hand it over, and start flashing devices.