Apart from taking up car parks and rigging area ,

, we get along great with our fellow kiters. We do have a large area to play in . I could definitely see a problem if squashed together in a small area .
I would make 4 rules to co exist. 1 , when reaching , coming head on , a windsurfer should pass upwind . This way we can safely pass closely . 2 , a windsurfer should not bear off downwind close to a kiter ,either head on or overtaking. 3 , a kiter should not boost upwind anywhere near anyone . 4 , and most importantly, Everyone needs a good look around when changing direction . If you can't because your learning or don't want to do this because you think you have a right of way , you shouldn't be in a crowded place . Unfortunately a kiter takes up a lot of room when learning and is dangerous in a crowded place . Learning wingers and windsurfers are not compared.
This is only my opinion and clash with general boating rules that are complex to think about in the heat of the moment and don't work mixing kiting and windsurfing .