I don't get this. Smart phone is an all in one already for you car's needs. I honestly don't see the point of installing dot in the car. Seriously. Use google assistant instead if you are so desperate for an assistant in your car, LOL.
I actually installed an app like what carplay does it's for android, I think it's called dashboard which also makes you operate your phone hands free for everything, navigation, phone calls, text messages even read your text messages for you. I deleted it.
I actually just tested google assistant. It does open all your apps for you. Well I at least tried spotify, maps, my browser and nest app, and it did open it for me via voice. Cool.