Absolutely: you are saying that Darkfins are for people who can't execute a simple helicopter turn without silting up the place. (This is actually a subset of the group that I suspect is the true target audience for the product, but that no one is willing to say or admit to.)
Helicopter turns are quite easy, allowing you to turn 360 degrees in either direction with a few simple flicks of an ankle, with the added benefit of keeping both hands on your camera. Ask Kevin Metz to teach you how to do them. He's the one who taught me back when he did my OW certification a few years ago. In fact he took the picture I posted earlier in this thread.