Maybe it’s cause I’ve never actually used it, but I really only care about a stable / well supported Bluetooth connection.

I have a holder for my phone for when I use GPS and basically never interact with it directly after it’s set. Only real interactions are media controls via the steering wheel.

The only use cases I can see car play helping with are those who take a lot of calls/texts in their car while driving and those who listen to music and want to listen to specific songs.