Not long ago I have seen some threads talking about porting android auto to an android head unit. The android head unit, mostly integrate car radio, stereo, GPS navigation, camera and others.So in my view, it's good enough for many scenario and requirements.

One of the reasons   for installing the android auto, that the android HU manufacturers don't want to provide full mirroring of smartphones, or an internal Android OS. And the Android Auto won't do that, you can even use Pandora or Spotify on it. In fact, the reason for the HU manu do not provide all the original functions is that it's easily to be sued by distracted driving deaths and maimings.

 

Maybe there's another way for the safe driving. Just like set the flight mode, we could provide the driving mode in the Android head unit? If so, there's no reason to reduce the original functions of the unit.