I have Xreal glasses, and it's handy to be able to pin a window to a physical spot (well, direction in this case). I used that feature to have basically a virtual TV on my laundry room wall while I watched a video on how to fix my dryer as I was fixing it. But if I'm playing a game or watching other content, I don't want to have to focus on a single spot, so I have the window always in front of my face.