Okay. Good to know. If they can do touch playback controls up top in their own native style that talk back to CarPlay, so that you could retain high-quality streaming over WiFi, rather than Bluetooth only, honestly I wouldn’t care if the main CarPlay interface were on the pilot panel at that point. The only other trick, then, would be navigation. I’d still want some sort of nav view up top, even if you had to control it from the bottom.
Things like messages and other apps being down below are less of a concern for me.