I have seen a few people mention how useful it would be to have the ability to cast a users screen (like bigscreen/mozilla hubs) for a variety of gaming/video reasons

What I don't think has been raised is just how important this feature is for VR conferencing.

VRChat can obviously already stream movies & videos from twitch/youtube, but the delay (30 seconds) is far to much to allow a VR presenter to control slides (on one of the theater world screens) or receive real time footage from real world webcams etc.

I know there are other projects doing this sort of work, but VRChat's Avatar and World quality is miles ahead of those projects and really hits the 'human interaction' aspect of remote conferencing far better than say Bigscreen, Rumii or Hubs.