Length of the control vector seems important; there’s lots of ways to use gross signals to control small vectors that don’t scale to controlling large vectors. Basically, you could imagine that question as something like “could you dance with it?” (doable in 2014) or “could you play a piano with it?” (doable in 2018), both of which naively seem more complicated than an (x,y) pair (at least, when you don’t have visual feedback).
Length of the control vector seems important; there’s lots of ways to use gross signals to control small vectors that don’t scale to controlling large vectors. Basically, you could imagine that question as something like “could you dance with it?” (doable in 2014) or “could you play a piano with it?” (doable in 2018), both of which naively seem more complicated than an (x,y) pair (at least, when you don’t have visual feedback).