This is a good point: GM will be eliminating Android Auto and Apple carplay, because they believe they can do it better.
(I have a BMW and like their navigation better, also - don't have it in the Expy '19).
However, today, the phone is 'you'. The majority of the people have the phone with them, with everything that entails for that individual. It doesn't start and end with navigation. Music, messaging, and so on, not even considering the features that Waze, for example, gives.
Further, just because Ford makes this specific thing good now, it will change in the future: buy-in becomes locked-in.