This is a great answer and I learned a new word today! I’m okay with diegetic elements, as it feels organic and as long as it’s not distracting I’m okay with that! I forgot about mirrors edge, the minimal(ish) design of that game is great.
I suppose saying “no HUD” was a bit narrow, the spirit of my question was more about games that don’t have displays and elements pulling too much attention from the game itself. I appreciate the response!