Why? I like sailing the boat not making adjustments and don't want to add any extra costs. Also two up boats would have an extra advantage as one ups already have too much to do.
Mast tip weight, should be kept.
Why? It keeps Aluminium Masts close to Carbon in weight reducing performance advantage. In OZ Carbon masts are far more expensive than Aluminium masts as the only moulds are for A class style wing masts, which cost aprox. double. Also has proven to be strong enough, but not heavy by other cat standards except A's.
In closing, we have to keep costs under control and realize, that people the world over have different access to materials, equipment and ability to pay for or build it themselves. I have met I14 sailors in OZ that have got out of the class because of expense of all carbon rigs and adjustable foils.
Doesn't hurt to discuss things though, keep it coming <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" />.