Agreed. But then we also have to admit that even when individual judges distinguish averages tends to lessen the gap. Also, as experts like gkelly have pointed out the PCS has to cover all levels of skating. With the top skaters you're really just distinguishing between 7-9s. Once you throw out highs and lows, etc. things get close.
This to me has always been one of the main facilities of the COP judging system. It makes no sense to me that you gain a PCS bump just for moving up a level of competition. Just because you are competing at the junior level doesn't mean that you have worse skating skills, presentation, etc. than senior level skaters. There are also plenty of Senior level skaters with weak skating skills and interpretation that aren't given the appropriate weight to balance out high tech scores, which places skaters who have spent the time to develop the skating side of the sport over the athletic side of the sport at an even bigger disadvantage because there is only a potential 3 point difference between PCS once you reach the senior level. It's not like jumps at the senior level are automatically worth more than the same jumps done at the junior level and the same should hold true for PCS.