You should be able to have it only show the music app or whatever if that's what bothers you. My cars default infotainment shows the map by default too, so this is more or less the same from my point of view (other than the fact that the car's maps are out of date).
> The last time I tried it I didn't like that I couldn't switch between different music apps without exiting the entire system.
As in you need to exit one app to open another? You can add whatever apps to the home(?) screen if you need to see them both at the same time, but if you want two apps to be fully open at the same time, that's not happening, as that's probably a hold-over from phone UI. Or am I misunderstanding you here?
When I tried Android Auto it actually took over my car's infotainment system and made my phone slightly slower having to drive another screen? I dunno it's been years. I just don't see the value in it personally.
For maps, having up to date maps is an enormous relief compared to relying on the outdated maps that came with your car (at least in my experience).
> When I tried Android Auto it actually took over my car's infotainment system
Yes. I prefer it that way. The car's default infotainment system might as well not exist for all I care, since I prefer the Carplay experience.
> and made my phone slightly slower having to drive another screen?
I haven't noticed this problem.