Hi there foil surfers

Has anyone have a glue why suddenly some manufacturers like Naish and North have started to produce edgy foil wings? What might be the real benefit? I Have designed some foil wings my self (tested, approved and used by some kite foilers) and I just don't get it. In nature soft and smooth shapes seem to be linked to hydrodynamic qualities, shark fins, dolphins and manta rays just to name a few.

Would be great to hear fellow kite foilers insight!

Cheers,
Totti