Why do you insist on ignoring the fact that top many being able to walk is intrinsically fun and immersive? You may disagree, but the core value of space legs is having legs.
Sure, I've seen both Strange Days and Avatar, but you have to remember what happened to the guys who thought so in those films: one got his brain cooked, and the other got turned into a Smurf. Having fun with legs obviously has a bad history.