This reminds me of DIR Internet Diver wannabees who actually have never attended real DIR JJ inspired DIR training who say nothing of fin design and style....

So to poke fun at the posers I remember once posting on the Internet how I was the leader of the new, REAL DIR Philosophy where to be DIR, o-rings had to be of a certain durometer and composition, that masks straps had to be of a certain radius and length and material....that mask defogger had to be of a specific composition in a bottle of a uniform size and shape, and the draw tube of the mask defogger spray had to be made of a particular HDPE, and DIR training specified that gel defogger was not DIR, only pump spray defoggers with a uniform 5 grams of delivery based upon volume, not weight, was DIR, and...ok, so you get the idea of the fun I had with it....

So if people want to go get training on peak performance fin technology, and split-fin finning technique hucksterism specialty, more power to em!