same debate occured 25 years ago in Open Division II class, as some may remember
initially pumping was forbidden, later this restriction was abandoned, and a wide consensus existed then the former interdiction was useless and baseless
pumping is simply part of windsurfing techniques, you have to know when and how to, which is not obvious, therefore interesting
such interdiction would be today more inappropriate, as often you need to pump to initiate planning. Who wants to stay in sub planning when he can start or maintain planning with some pumping ?