I am a bit dated in the sense that I was diving pre-DIR and pre GUE (but not pre-Hogarthian).
Given that history, I tend to differentiate between DIR and GUE. DIR was something anyone could learn and the process was more one of mentorship with the tehchiques passing from dive rto diver with much less formality. It had strong hog roots but it did not stifle the idea of experimentation and optimization to find ever better ways to do something, whether it was a new technique, a modification to a configuration for a specific circumstance or a new way to make a piece of gear.
GUE on the other hand is the agency version of DIR and tends to come off as being much more formal and much more limited in terms of its focus. That part of the map says "There (can) be zealots here."
What does it all mean? I dove plates and wings long before they were cool. I was swimming 3 or 4 inches off a clay silt bottom leaving no trace long before fundies was even conceived. When I used to do long deep dives in very cold water and/or ice dive, I used a pivot ring harness with (gasp!) a quick release as it made it much easier to get out of your gear when very cold with very cold and stiff hands. And it made it easier for a buddy to help another diver out of a hole in the ice without taking a z-knife to a one piece harness. It was in short optimum for the dive.
Similarly, when I dive in a cave I have no lift bag, when I dive open water, I have one bungeed to the bottom of the plate and when I dove offshore, I have a orange and a yellow one bungeed in a very stroketastic OMS carrier because it works and leaves the pockets on the suit free for reels, spools, signal mirror, etc. Again I try to optimize for the situation.
I do dive with a right hip d-ring (3 pieces of overlapping webbing and a piece of velcro let you put the light over the webbing without having to thread it and let you carry the can light just like you would without a right hip d-ring.) I tend to carry a reel on the right D-ring. It is not strictly DIR but it is easier to access than in a pocket and it does not get hung up with a stage and SPG on the left. Offshore I am far more likely to tuck the long hose under the webbing than under the can light, since with a giant stride off shore entry and surge, it stays put better and horror stories aside, it is not hard to deploy, they get half of it immediately and the rest pulls free about a half second longer than if it were under the can light.
In short I tend to be DIR, but in the sense that I follow the basic hog tenents of streamlining and ensuring every thing brings something to the dive and then think through what I do and then I do it with the intent of optimizing for the wide variety of conditions I dive, with as few differences as possible to ensure everything is as streamlined as possible and comes to hand when I need it.
So I'd consider myself DIR, but a significant percentage of GUE trained divers would differ with that opinion since I break some of the rules that GUE promotes. I do dive solo frequently and I have a ong history of zero viz commercial dives where solos is both easier and safer than getting entangles with a buddy. Again, it depends on the circumstances.
Is the difference between DIR and DIR/GUE a problem? Not really. If I am in a cave, I configure like the more dyed in the wool GUE buddies and the reel is usually not an issue as unless I am leading it gets left behind and the safety spools and gap reel are in a pocket. If I am leading, it gets used soon anyway.
So I don't think "DIR" by the original definition is restrictive and the degree to which it is a "problem" with other GUEish DIR divers depends on whether you dive with that small minority of zealots that DIR/GUE people don't even like, who tend to substitute strict adherence to dogma for brains and/or experience and who will in any event refuse to dive with anyone who never took fundies as every one of them knows and will tell you that no one can have good buoyancy without passing fundies.
Oh...and the superman avtar thing... it makes sense in a high flow system or a restriction as your hands end up in that vicinity anyway, and in general I think it does tend to get people to arch their backs, stay level and avoid getting roto tillery but in open water and most wrecks, I just can't bring myself to do it as it looks to Mike Nelson'esque.
I also agree that waterskills are under respected. Back in the day, you were often advised to limit your max depth on scuba to twice your freediving depth. After not freediving for years, I can still freedive to 60 feet with no problem, but that is sadly probably a rarity in both the rec and tech comunities where I am not sure many divers could even make it to 20 ft with any geat degree of comfort.