Put a floorless shelter on wet ground and it quickly becomes dry ground, unless the water table is above ground level. That said, I can't see a floored shelter working in a bog...
Not all floorless are tipis...some have a low profile and pitch with a ul squatty pole or two.
OTOH,If it's two guys against one sheep, there's no reason to not use a bomber tent. A few extra pounds won't break the hunt. Pitching floorless on rocks is tougher to anchor.
