Kitesurf has less wetted area w.r.t. sail size. It is a similar evolution than windsurf vs. sailboat. It took the speed record from... the hydroptere (which has a small ratio as well) after windsurf dominated the scene for around twenty years. Reaching 55+ knots requires efforts and dedication as well. So it may be easier to start but at the top level you find the same athletes than in windsurf, IMHO. And by the way some are doing both.
Poster #48, yes this is one of my deep regrets, but their life is full of other things. The last one (12) is not completely lost for windsurf yet. One day he will rediscover my stuff and say "hey, let's try that crazy truc Dad was doing in the past".