The are limitations for sure without positioning. From first hand experience, humans just prefer the 3D experience because, and this is kind of sad but kind of expected, people just want to keep their heads buried into their phones instead of looking at the world around them. So if you give them a video route that can get them from the entrance of the building to where they need to be (and serve them ads $$ along the way) - the UX wins - sans positioning

But in the event of an emergency evacuation when you have no idea where that device is in the building - you are up a creek