I’ve been thinking this for ages
But the other big thing no-one seems to be noticing is that it looks like it’s only additive light. Like how a projector works, or making a photoshop layer set to screen, it can only add extra light to the scene. It can’t make any pixels darker. That’s why that demo on the telegraph is shot in a badly lit room.
And it’s why you can tell those previous demo videos were lies. Because they did create extra black. How would that possibly work? You can’t make things seem real or make virtual screens if you can’t make dark colours. You can’t use it outside. You can only use it in a dim room. So you may as well just get VR. Or VR with some cameras to make AR.