It's true that you can't use a full pedal stroke in water less than about 18" deep, but you can "flutter" the fins while holding them horizontal and still manage about half speed in eight inches or so depths.
I'll agree with the weeds and submerged objects observation, though. I also wouldn't take mine down a river without some degree of trepidation unless I pinned the fins and used the paddle. Then I'd be no different than a regular kayak, of course.
Touring Kayak Paddles
EZ-Dock modular docks
Full Size Sail Rig
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