Regarding sail weight; to get similar strength equivelents, higher tech sails will invariably weigh less than Dacron. To require a high tech sail to weigh the same as the Dacron sail is in effect, a cute way of eliminating high tech sails from anyone's inventory.
I'm OK with having a sail weight requirement if the purpose is to insure that someone doesn't go out and buy a "throw away" sail for one race or one regatta. As well, I'm confident that the sailmakers will be able to tell us what the proper sail cloth weight should be for an all purpose, high tech main.
Bottom line, the class needs to decided whether to go unresticted on main cloth or not. Who's kidding whom, putting restrictions on high tech sails that make it so impractical to actually have one is not a solution - make a decision!