Comment by rtkwe

Projectors have been strong enough to be visible in decently lit rooms for ages. The reason you want the room extremely dark for most projector setups is for contrast, because the darkest thing you can make on a projected image is the ambient surface illumination (and the brightest is that surface under full power from your projector [0]). If you accept that compromise you don't need a super dark room, the recommendation for tight light control is mostly for media viewing where you want reasonable black levels.

Do still need to keep hands out of the light to see everything but that can also be part of the interaction too. If we ever get ubiquitous AR glasses or holograms I'm sure Bret will integrate them into DL.

[0] Which leads to a bit of a catch 22 you want a surface that looks dark but prefectly reflects all the colors of your projector so you need a white screen which means you ideally want zero other light other than the projector to make the projector act the most like a screen.