Dinghies in under 10 knots.
Windsurfing is at it most efficient in planing coditions.(For most 13knots +?) I suspect to maintain interest in under this you really need to be racing.And if racing in under 13 knots I would rather be in a Dinghy.
Its probably why non-planing windsurfing has almost died out.
So in a way I agree with Floyd
BTW the whole emphasis over past 15 years has been to lower planing threshold in WS.
There is less non-planing sailing than ever !!!