

That’s nothing to do with android auto/car play and entirely down to the manufacturer of your car being an asshat.
Is it a Mazda? Mazda is one of the worst about this. I think they’ve gotten better in their latest cars, but that doesn’t fix the existing ones.

You probably can, just nobody bothers to do it. My Subaru has installable apps. Hell older Hondas (and possibly current ones) just run android. You can even get to the regular android UI on them.