If my OW instructor didn't teach me non-silting kicks, or polish my buoyancy, how is that MY fault? At that point, I didn't know such things existed. I was trying to survive underwater in a confusing and fairly hostile environment.
Frankly, if I hadn't been told about Scubaboard, the only thing I would have heard about DIR was that it was a bunch of cultists that came out of a single cave-diving project in Florida (my instructor's phrase). I would never have met NW Grateful Diver, or Uncle Pug, or JasonH20 -- I would never have read all the DIR-F reports, and realized that somebody, somewhere, was teaching the things I had figured out I wanted and needed to know, in the way I wanted to be taught.
I wish I had access to a DIR-Essentials course. Instead, I'm taking DIR-F in November, and understand that I will fail. It's kind of hard to go into something knowing that. I wish they divided the course, at least for people like me . . . introduce the skills and let you practice them, and come back six months later to test. Sounds like this is what AG has put together, and it sounds good to me. I cannot be the only PADI-certified diver who feels she has holes in her skills that need to be fixed for safety and improved enjoyment.
I don't know if an GUE-OW course would fly. I think maybe you have to go through the usual course, at the usual cost, and during it or subsequently realize that you were taught "diving lite" and there was more out there to learn and to do.