The most active classes are going to see the most design iterations as the manufacturers fight for dominance. But again, like I said before, while the changes are exciting and revolutionary in appearance, the effort on part of the manufacturer and designers is fighting for a 1-2% (or less) advantage on the water. I would estimate that my skill at sailing these boats is extracting anywhere between 80% and 95% (when in our sweet spot of wind strength) out of the boat. Will 1% help me? Maybe...but not as much as going out to practice practice practice with the boat that I have.