you say we are stopping lightweights from sailing F16, as they can't right them due to the mast tip being to heavy. <img src="http://www.catsailor.com/forums/images/graemlins/shocked.gif" alt="" />
What cat can they right? The A would be the only one lighter and with it's mast 1/2 a metre taller all you need is some water on top of the sail or dacron soaking up water and the difference is minimal. How attractive to these jockey's is a class with a larger main than a A class and a 17m2 Spinnaker to boot.
Sorry but I think this argument is a Furfey. Besides the tip weight rule is one of the newest for the class, it was reduced not long ago and if I recall correctly the class did not want to drop the tip weight rule then.