I don't understand this insanity stuff. We have a $35 chinese brand (Ugreen FWIW) bluetooth adapter in our car. If it connects to my wife's phone when I go start the car (or opposite), all I have to do on Android is to pull down the notification drawer, long-press the bluetooth icon to open the bluetooth settings, then click the name of the desired device in the list that comes up. 10 seconds later it has connected correctly.

This $35 dongle also has pause/play and skip buttons, and you can use those to answer calls as well. The buttons are tactile so you can use them without looking.

Honestly, the only bad thing is the built-in microphone delivers pretty bad audio when you use it as a hands free. But for $35 I cannot complain.

My old car used to have a cable that was connected to an audio tape inserted in the radio. I just needed to connect my MP3-player to it and off I went. It just worked. No 10 seconds waiting for a connection or 10 minutes fiddling with options.

Once I was hovering the car at the gas station and the cable went into the hose and broke off from the audio tape though so not everything old was better... :-)