Mark-
I agree with your point: "It matters even more if you can't adjust your rig and sails as per class rules."
One problem is how does one distinguish between the classes where this IS permissible and those where it is NOT (and then of course you have boats who specifically "go around" the one design class rules when racing in "open" regattas)? I think that is one reason it is hard for a Committee to "fairly" implement weight corrections "across the board" and you get into the whole issue of crew weighing too. I think far more people are disadvantaged by sailing with "fat" boats than heavy crews and yet there is no "compensation" for that yet to me it's even more "unfair" that someone with a 480 lb. H 18 at minimum crew weight should have to use the same PN as someone on a 400 lb. H 18 that's 20 lbs. over "minimum crew weight"-
Just some thoughts-
Kirt