> You can answer the call and switch back to Maps while the call continues, right?

Yes, I can, and currently have to, but absolutely 0 times I've answered a call in the car and want the Phone app to cover the entire screen, no matter what I had there before.

It's just extra dangerous when I'm using maps, as maybe I have a turn I have to make in that exact moment, and having to go back to the maps just because some designer at Apple want to showcase their contact/name/phone number layout in the Phone app sounds like asking for trouble.

Sometimes I quickly want to just say “I’ll call you back” and end the call.