When I bought a Rivian I missed CarPlay. There were a few things that really stood out.

1. Proper Voice Texting

2. Google maps for routing with (good) traffic data.

The Voice Texting just a release or two ago - its okay so far but not as good as CarPlay. Google traffic landed a while back (in Rivian's map which I prefer over Google Maps)

I'll take the voice texting for what is otherwise a very elegant and well designed UI - that keeps getting better.

Full disclosure. Even when I have a rental with CarPlay I just use Spotify and google maps. Both of which are integrated into the Rivian UI. So YMMV

And that’s the thing isn’t it? Often the same app is better on CarPlay/android auto than it is in the native UI for the vast majority of cars.