I'm no physics expert, but I think maybe "big guy big board big kite big fins" is theoretically faster than "small guy small board small kite small fins".
Same as it is with windsurfing, if not more so, since there's less physical constraint on how big you can build a kite than how big you can build a windsurf sail. Plus the ability to sine the kite for power gets rid of some of the slow-acceleration probs that big windsurfers have in lighter winds.
With the bigger guy and bigger setup the gusts and chop are probably evened out more, and the guy's tallness probably gives more leverage, too. Kinda like huge multi-hull sailboats are faster in ocean races than small multi-hull sailboats.
Maybe the anxiety to quickly implement a box rule is to keep huge guys on huge boards and kites from coming in and dominating the class? Shaquille O'Neal on a 30 meter kite and 85 cm wide board with 60 cm fins kicking everyone's ass?
Well said James.
While they are touting the box rule as a way to grow the sport it is actually about limiting the type of riders.
I think that there should not be limitations to board and fin size.If the heavyweights end up dominating the sport them make a few classes based on weight.