Agreed! I'm far from "DIR-compliant" and I'm certainly not qualified to do anything approaching "technical" diving, but I'm definitely envious of the typical skillset I see from GUE/UTD/etc. divers. More importantly, I think that once you dive with those folks, it's really only a matter of opening your eyes and watching to see the practical benefits of some of their gear choices.
Bungeed octo? Upon seeing that for the first time, it immediately made sense to me and seemed like a really smart way to make a primary 2nd stage issue as comfortable to solve as possible. ADOPTED
Long hose? I haven't made the switch yet (still shopping for a can light to use as a hose catch), but I've been present-for/participated in OOA drills with somebody on a long hose, and I can tell you without hesitation which setup I'd rather use in an emergency. GOING TO ADOPT
BP/W? I was at the point where I was really happy with my Scubapro Knighthawk. My weighting was dialed in pretty well, and by and large my trim felt good. I felt like I'd hit a wall though, because the damn thing was extremely difficult to keep from sliding around a bit. Switching to a continuous webbing harness (even with the Halcyon cinch installed) has been a very noticeable improvement. My tank stays solidly positioned, I've got more weight on my back which makes trimming out
way easier, and I've got less padding and clutter getting in my way. ADOPTED
Philosophy doesn't have to play into it at all - most of the choices simply make a lot of sense.