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The trick is Airplay, which is a wifi protocol Apple licenses for not too much. However, "not too much" is more than "nothing" which is what bluetooth costs, so most things you want to interface remain bluetooth.
... and that auto manufacturers release ONE version of software for their head units, and then ignore any software updates forever. Oh wait. That's not right. I can get a software update for the head unit in my 2015 Chevy... for $632. (Literally sticking in a USB, clicking a button, and waiting for the update to complete. And it is over $600.)