Fingers are for manipulation -- not movement!
You've only got so many fingers and thumbs... So, don't waste them on movement! There will be plenty of things for your hands to do in VR, just like in reality! It really is this simple: let your lower body take care of movement like it does in reality! The turris allows this to happen quickly, accurately, and without you breaking a sweat!
With so many cool technologies and applications coming down the pipe in VR that are tracking your hands -- and even your individual fingers -- let the lower body take care of moving, it's great at it!