I definitely think other beach users like families/children/sun bathers should have priority, no doubt at all in my mind !
Firstly, it is quite rare (here), that there is a lot of wind AND extreme temperatures, so not that often it happens simultaneously, and of course we should just get the "heck out of there".
Sometimes, if I/we came first and the beach is empty - and it gets filled later, when going ashore - we dont move just as much always, especially as most think it is soooo fascinating, so we have a lot of good conversations, and they could see that we were there (had all our gear/boards/bags on the beach), so sometimes not necessary to move except for putting the kite down next to the beach goers and not in the middle of course.
Swimmers - we have to take care and look out for them, our full responsibility IMO.
Boaters - we have a lot of row boating here (competition and freerowing or whats it called..), and we should give them way too, and pass in a safe distance so they dont get scared.
Motorboating (not that many actually, as we are a sailing nation here) - they always avoid us, and think it is fine that way.
Fishermen - hmmm, THEY are a big problem often....
We have many tourists from other countries (but also native of course), who stand either on the beach at the very best wave point break, or out at the pier at the very best wave spot.
I must say, I really dont know how to balance this....
Because, they will say and think we should just move away, as there is plenty of water.
And we have only picked the very spot because of the point/pier break.
Mostly, I ride quite close to the lines (but a bit scared of getting "hooked"), if they came "last".
If they were there first, I keep a bit more distance.
An interesting topic actually
Peter