The challenge is in best responding to the input of the end user and their intent. I want to be able to run forward in the direction of my torso while looking over my shoulder as something is chasing me, and I still need to refine the precision / technique of my approach. A 15 degree margin of error may not be good enough for what I’m trying to do because it also means that I would change my direction of travel by 15 degrees, which could mean that I’d run into something if I’m running down a straight hallway.