> if this doesn't get reasonably full access to the App Store then it's a no-go for me

This was one of the stumbling blocks that really put the final nail in Meta's Portal. You could call your friends on messenger or WhatsApp, but no 3rd party story for FaceTime, Zoom, Google... was a real problem for most folks

I believe it supports carplay compatible apps.

According to Wired, “a handful of third-party media apps like Spotify are available, and developers can bring over existing CarPlay apps.”