I would love a picture in picture rear view. Racing and sprinting to the finish you need to look forward on the main screen and it would be helpful to see what’s going on behind you as well. Something small is all and out of the way. Too hard to look over your shoulder by changing views while pushing 800w to the finish line.
I would like to upvote this one. Hopefully, others too will join in.
I do not personally race but if you see someone right behind you coming up, I will crank myself up.
For group ride sweepers giving people wheels it would be good to gauge if the other is still in the draft etc.