This is something that bugs me a bit with a lot of ScubaBoard posts. What you saw was the skills exhibited by technical divers. It is required for the decompression stops associated with deep technical diving and with cave diving. GUE did not invent it. All technical diving agencies teach it. Contrary to the impression provided throughout ScubaBoard, you do not have to go to one specific agency to get that instruction.
That's true. On the other hand, a lot of the time, the person who gets credit for something is not the one who first comes up with the idea, or even creates a prototype, but the first who does it really well AND achieves some level of adoption and visibility. iPhone was, in fact, a somewhat incremental product... what set it apart in the eyes of an average consumer was the quality of execution, and on the basis of that commercial success, for all intents and purposes, in the eyes of the general public, they got basically all the credit for "inventing" the modern smartphone. A while back, when I was still in academia, my advisor used to tell me that "vision is cheap", and in a world, in which everything depends on credibility, the only "currency" that matters is having the real thing in your hand. GUE has the real thing. I have either taken classes from, or interacted with instructors from 5 agencies, and in my (admittedly modest) experience, the amount of good, detailed feedback that I was able to squeeze out of my GUE instructor was the best, by a large margin... this applies to both class, as well as mentoring outside of class. It's all about the quality of execution, and the predictability of the results... to reiterate my earlier point, the implementation is just as important as the idea itself.