Looks like, this is because desk is physically much more controllable environment, than couch. For example, to use mouse, you need precision distance from sens

Looks like, this is because desk is physically much more controllable environment, than couch. For example, to use mouse, you need precision distance from sensor to gaming surface. It is possible to use some expensive technologies, to achieve high precision on couch. For example, good precision have optical trackers used in movie production mockup, but they are expensive. They are slightly slower than best mouses (about 200Hz measurements frequency), but I think, good enough for most gamers. https://arstechnica.com/video/watch/how-the-callisto-protocols-animations-came-to-life-with-motion-capture https://arstechnica.com/video/watch/how-the-callisto-protoco...