I think part of the issue is that people judge configuration variations based on when everything is going right, not when it goes wrong. If everything is going right, most of the variations are a big, who cares? And things rarely go south, so after 100 event-less dives, a diver begins to believe that there is nothing wrong with their configuration, skills or mindset.
But when things do go south, then the real truth will come out. It's amazing how the simplest unclipping maneuver can suddenly be a giant issue under multitasking pressure. And then one problem can snowball into another, and two "simple" maneuvers can rapidly escalate into a crisis.
However, if you've ever done dives with "team" divers whose gear choices and placement and procedures are standardized,and who train regularly on their systems, you understand something about dive safety that people who have not experienced it (except on the internet) don't.
Do 100 unified team dives with competent team divers, and then tell us how it's all an egotistical, tolerance-reducing, Stepford-diving way to dive.
Gear and agency training does not automatically make someone a great diver, and I've seen some amazing divers who snicker at GUE-ish diving and gear. I'm not DIR (never even passed fundies). My tech instructor is not DIR (although he is wise enough to see the positive merits of team diving and equipment configuration standardization). For goodness sake, I even dive solo sometimes, and I'm now diving CCR, which is the biggest stroke-machine for diving there is. But I've seen team diving and gear standardization, dived with many excellent team divers, trained with them, and I've see those divers under fire. And, IMHO, I have not seen a better, safer, more predictable and consistent and fun way to dive.
Dive any way you want (I do), but I don't think someone can realistically critique something they have not experienced.
Just my .02.