I will second a number of things already said by others:
First off, I really enjoyed it. I hope this becomes an option we can select any time for any ride unilaterally
I personally would like it better with no nameplates at all.
For racing, I would be very interested to try racing (I am usually far at the back of D) with no UI, no nameplate, no map and see how it feels. I think it would be a lot of fun. It would be different from what we are used to by a lot, but I think it would add more “fun factor” to racing. It is kind of odd right now to race seeing the w/kg in real time of other people even far behind me or far ahead of me. It would most certainly change final sprints if one can’t see as well who is behind, but I don’t have a problem with that as it would impact all equally. It would be a different thing, not a bad thing.
Racing with nothing but some bib numbers and team jerseys would be something new and good, I think. I am usually sprinting for “not last”, so I can’t speak for those sprinting for “not second”.
As the first time using discord in Zwift, I enjoyed that (once I turned my mic on it was even better).
I rode mostly in the over the shoulder view, but swapping in and out of first person of course is fun as well. I would not lock the camera to first person, however.
Having no map or slope guide is a good change to as it makes us ride differently and more immersively paying attention to the terrain and other riders more than with the UI always telling us data on everything and everyone.
Having the option to turn off UI elements one at a time has been requested before… I think!
If I had to have one single UI element as the sole element remaining on screen, I would pick the little power graph at the bottom (or an even smaller version of that somewhere I could place on screen). I like for general fitness to see the colors of my power as I ride to keep in one zone or another for a time period in free riding.
I had done this previously a bit with the XML tag, but this was far better with a group of people all experiencing the same thing.
I I had the option to ride with nothing but a little power meter somewhere or a little power graph, that would be my preferred method or riding.
The only concern I have is how to give ride-ons with no UI. Maybe the Companion would have a new screen just showing the 6 riders closest by with big ride on buttons as the feature of that screen, so we could easily dole them out and still keep a clean UI in the main game screen.
p.s. I ride with a projector showing Zwift on a wall, so having no UI really made it seem like reality seeing the world and riders life size and un-cluttered. The virtual went away.