I was always one for the elbows and knees but that is dealing with both arms and legs, knees and elbows as weponry and head as a weapon too and those points are the stop points and also the major balance points for disruption as well as the points that move at half the rate of the attacking appendage if its a full extention attack.
I think it works great for just the arms too as in boxing, but it takes slight adjusments in range and places you and your blocks futher in which also stops the full launch process and forces bodily adjusments in order to be able to get one off clean in reply.
I dont think it would serve all the time but is definatley useful if your at the stage in some battles of adjusting distances and power for disruption of their movment and quelling arms before they can move and then using feeling from that inner point.
I like the thought of varying eye contact for a whole fighter not just for boxing ,eye to eye at non contact range,eye to centre at contact range (extended foot),eye to shoulder at hand range (extended fingers),eye to elbow at that (elbow and knee)contact range and central to everything at full contact ALL range becuase you instinctivly know where all your targets are at that extreme inner stage, you dont have to rely on sight at all at that stage ,its eventaully faster if you dont because there is thought in between sight and reaction and less thought in between no sight and straight reaction.
Just an idea to play with, for some, not take too seriously for others ,but works perfectly if you use it in the right curcumtances.