It's exactly what I think a lot of techies want.
Highly technical people tend to come in two varieties when it comes to electronics in their personal life:
1. Absolutely nothing smart that's not under their direct (or highly configurable) control.
2. Sure just take all my data I don't care. I'll pay subscriptions fees too.
Modern cars mostly do #2... to the point we potentially faced a subscription being required to enable seat warmers [0]. There's basically no cars on the market that do #1 anymore.
And with #2, you're bound by what the vehicle manufacturer decides. They are ending up like forced cable boxes - minimum viable product quality. They can be slow to change pages/views and finicky in touch responses... which I think are actually more dangerous... but this is our only option if this is the car we pick... and almost no one decides on a car for it's infotainment, so it's not a feature that gets much love or attention.
Additionally, technology moves too fast. My first car had a tape deck. The next one had a CD Player.. then I had to get an mp3-player-to-radio dongle, then I replaced my infotainment system with a bluetooth supporting one... and so on.. Even Android Auto (early versions) integrated directly into the infotainment system and needed potentially proprietary cables (USB-to-proprietary connector), and the systems did not look designed to be upgraded/replaced.
This model here allows you to upgrade your infotainment system every time you upgrade your phone (or dedicated tablet)... or simply by changing apps.
Also, Android Auto has mostly solved that UX issue (It's the same UX on a tablet as on an equivalent built-in infotainment system).. Though iPads probably (?) don't have a similar feature.
So I think the 'bring your own infotainment' idea is awesome.
0: https://news.ycombinator.com/item?id=23718101