In this case, these are very complementary and can even be considered the same thing. the core Android auto idea is to give a driving interface with limited fea

In this case, these are very complementary and can even be considered the same thing. the core Android auto idea is to give a driving interface with limited features, less distractions, large legible texts etc. It is by default displayed in the car displays but there can be cars which do not support this. For those situations Google had a solution to display the same interface on the phone. This was especially useful for people to get used to this technology before upgrading their car. Google probably decided that there are enough bee cars and enough after market units with this technology that they don't have to support this anymore. I think it is too early considering there are a lot of older cars on the road and there is a acute shortage of new cars.