If you phrased it that way, I'm not terribly suprised you got banned.
The arguement is that the wider range of motion= more work. This may very well be true PER REP. However, I feel the last third of the arc is significantly slower than the rest, so your ability to do work PER TIME is dimished.
For example, my Pekiti Tirsia instructor is starting to get heavily into Crossfit. He is in significantly better shape than me as far as metabolic conditioning. If we both swing the standard 35lb'r, he does about 10 swings in 20 seconds. I do 15 in the same period, and I am smaller and have inferior metabolic attributes. Clearly since the difference is not my attributes, it's got to be the way we're swinging. I feel the RKC method maximizes the amount of time we work on the hip motion for any given interval.
I also have some reservations about the range of motion at the top for your shoulder, and how it would interfere with learning a skill progression(using the swing to teach snatches, cleans, and high pulls), but don't feel qualified to speak to that. I would note that in crossfit Oly lifts are taking the place of the more advanced kettlebell lifts, so maybe the need for a planned kettlebell skill progression is percieved as less?