What what whaaat?? Yes the perspective the golfer sees can make some monitoring if his own swing difficult this is why mirrors lasers and authorized instructors are your friend, this aiming point may be a problem for some but it also may be very valuable to others I wouldn't put it in the useless theorem category that's for sure.
Without the Aiming Point concept, the player is executing an inferior Pivot Controlled Hands procedure, and will find out what real problems are.