Yep, exactly.
The huge difference here is, that on a windsurfer you have the mast foot load that can help control the board.
On a kiteboard you dont - so it has to be self stable in another way, thus it would never end up with the same design as a windsurfer, thats for sure
In fact, 2 fins has proven to be way too unstable (or not tracking), almost with "whatever" shape that has been tested till now it seems.
So whether it would be a 1 or 2 or 3 or 4 or "whatever finned" - time will tell where we end
But the upward lift factor from the kite, despite the lack of mastfoot pressure, is what might make the kiteboard overall superior to windsurfers, even with another fin system (maybe)
Peter