If find them amazing fast, those kiters. Hell, they are breaking speed records almost every day. Respect.
It's a pity that they need so much place.
I've been also in Leucate this summer and must admit that the kiters I've seen were all very polite and friendly towards us,windsurfers. Most of them immediately put there kite up when crossing or passing near by. I felt safe. Chapeau !
Don't think they plane earlier then us. On the contrary, I think we plane earlier on the "big" formula stuff. Too little wind and their kite falls out of the air, the board sinks and they swim.
While we sail, they fly. It's personal preference.
For me they have only 1 real advantage: their gear fits in 1 backpack. That's the only thing I envy. I need a surf trailer to carry my gear.