NorthernKitesAUS said..
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You're assuming everyone wants to yawn and mow lawns, with a foil board.
Foil boards are by far the most versatile and fun water craft ever invented. The only limitation is your imagination. Boosts, carve, glides, slides. If you can imagine it you can do it.
I was going to say shallow water is a bit of a limitation (which it is), but with a bit of experience you can foil through knee deep water very easily. You just need to keep the foil up high. As long as the bottom is sandy you can get away with bouncing the foil off the bottom as long a you don't mind the odd scratch and the occasional crash.
If you're powered enough and have a big enough wing you can water start sideways straight up onto the foil. I tend to avoid that in shallow water. It seems pointless to risk damage to my foil when I can just drag a few more metres into deeper water.
You can do all the usual stuff, but the energy retention of the foil lets you do heaps of stuff that you can't even imagine riding surface boards. Lots of whip carves, descending glides, rotations in both directions etc etc etc.
The same can be said for huge kites. It can be dull and scary being hauled along by a giant kite, or you can use that power and the slowness to do stuff.