Some prefer straps for changing feet and stepping easy into the right position as the straps can lead you, especially in tacks.
Others got it just opposite, the straps are in the way when changing feet.
If you don't jump, there aren't (m)any advantages using straps on a hydrofoil, because you stand centered in balance and there are absolutely no bumps or bouncing from chop, always totally clean and smooth on a hydrofoil.
So no gain with straps.
As opposed to surfboards, where you can do so much more with straps, and where the water chop is constantly trying to get you off balance bouncing the board.
Personal preference what one likes in both cases though.