And at the same time the car companies want to move away from Apple CarPlay, which for any of its fault is a substantially better UI than we can expect the legacy carmakers to produce.

That’s all about money… they don’t want Apple to sell services to their customers when they believe it’s “their” territory.

Carmakers want SaaS revenue as well now.

They just want to sell their navi map updates like they used to before CarPlay was a thing.

I used to drive a range rover sport that would display a long pop up with some legalese about focusing on the road while driving when I hit the navi button. It required acknowledging.

That wouldn't be a problem if it weren't that the built-in MB navigator is by ar the best I've ever used, and definitely better than all of the apps (Google Maps, Apple Maps, Waze, Nokia Maps, TomTom, Garmin, etc...).