Is it a big deal? Not at all because I hang my phone close to my wheel and it's much better than the screen of my car.
A friend of mine connected his iPhone to my car and it worked but the result is underwhelming: the screen of the phone is still much better. There is no reason for me to go through my car to do stuff on my phone.
By the way, phone calls and media work on the Bluetooth of the car and that's all I need from it.