Because a lot of manufacturers put control of the car's settings in the stock head unit. You'd have to swap it out if you want to change a particular setting.

Because a lot of manufacturers put control of the car's settings in the stock head unit. You'd have to swap it out if you want to change a particular setting. What I'd be willing to compromise on is an external screen that will handle CarPlay or Android Auto. I can't seem to find one out there.