Eh I've had decent experiences with BT in cars, there are some truly terrible implementations out there though.
My current vehicle doesn't have a functional BT connection, because some idiot put it behind a voice activation (and the mic broke).
I don't think this is the long term future, though - I've seen it work really well, if consumers actually start caring about how to connect to their cars it will work better.
BT will always "just work" - Android Auto and Carplay (never used) are enterprise monstrosities you must sign your soul for in blood that don't work on Thursdays, by comparison.
Yeah yeah I'm sure it does some app thing but I honestly don't car, what with cellphones becoming less reliable over time. I only want to play music in my car, BT works great (once it is setup).