I would suggest people come and kite/windsurf in tassie - never had a bad experience here. Of course, if they did, then maybe I would...
I personally find being out with windsurfers challenging. For very good reasons, windsurfer rules state the outbound vessel has right of way. ie underpowered for getting out through the white water.
Kiters: the outbound kiter should stay out of the way of the one on the wave.
So when outbound windsurfer meets incoming wave-riding kiter, the expectations of both are boogered.
In a place like Tassie, I just clear out to find a different bit of beach. I think if I were in a more crowded place, I would very quickly get sick of eternally being subservient, and be prepared to assert what I see as my "right of way" occasionally (flame suit on for the purposes of the visit to the windsurfer forum).
And top be honest, even here on one occasion I have been frustrated. 8 km long beach, group of windsurfers, couple of kiters. I intentionally stayed down wind the entire time - which would be fine, except that the group of windsurfers gradually moved down the beach, forcing me ever further from the adoring crowds/cameras

. No angst, but I did find myself wishing they could sort themselves out and stay in the one place
In seriousness, I don't believe that courses ever change behaviour. They cost a lot of money, and demonstrate that a problem is being taken seriously. But they seldom achieve anything concrete