I was telling my gf this yesterday as my car refused to pair with her phone (she had to unpaid it so that it wouldn't try to connect when we were driving both our cars nearby) which I guess is a necessary step of connecting (I am not sure I've ever successfully connected two Bluetooth things without pairing them) before the traffic light turned green and the car locked up the Bluetooth UI, so that the driver couldn't operate it, which meant that both the driver and the passenger spent loads of extra time fucking with it until giving up and playing the song directly from her phone's internal speaker
I have never ever seen Bluetooth work as intended