OK many thanks Remi,
That makes sense for lightwinds when you either rail the board or you are going to go much slower. I still think it has to be an (multifin) application for racing planning boards (formulas, slalom) and freerace-freeride boards, where multifin boards would provide better control and range without a significant speed loss. If that is not possible how can you explain they are the board of choice at modern kiteboard racing?
All the best