Can you be specific? You think they can't cram in enough cameras and a lidar? The see through display is the elephant in the room and it's actually progressing.
You could add more cameras and lidar for depth, yes, but then you'd also need a display for the other eye, and you still wouldn't be able to do immersion because your displays are transparent and have a tiny FOV, and you're also not doing passthrough, so why do you need the cameras again? And so on.