In my opinion who cares if it breaks the car gps. I have my phone that already does this function and never needed my car to do this. I would a thousand time over delete my car gps if it meant no tracking.
Meanwhile I'm actually the opposite. I'd prefer for my phone to pull from the car's GPS system instead of trying to figure out its own signaling. It would probably be a lot better since it's not locked in a steel cage and in suboptimal placement.
Yes. I can see turn my phone off or turn off location services or leave it at home since cell towers can track me should I really want to stay private. For example should I visit a brothel I might want that private. If I was going to a HIV clinic I might want that private. Should I be be cheating I might want that private. All made up examples but we should have the ability to remain anonymous and not have our car companies selling that information.