GUE’s end goal is completely different from the recreational agencies. GUE—and other technical agencies—aim to provide team-based divers who can safely work together in overhead, deep and other challenging environments including expeditions. Recreational agencies aim to produce safe divers in relatively simple benign conditions within no-decompression and no-overhead limit.
I don't necessarily disagree with what you said, but maybe I can expand on it.
As you may know, GUE has been trying for a long time to establish themselves as a legitimate recreational agency option, not just a cave/tech training agency. Look in their literature, and you'll see pictures of people cruising along coral reefs in addition to all that cave/tech diving. GUE offers the full OW course, known as Rec 1, for people with no prior dive training.
Sure, GUE's approach is "team-based," and they do aim to turn out Fundies grads who would, as you said, be capable of working together in more challenging environments, but that doesn't exclude people who consider themselves recreational-only divers. A "team" can be, say, a couple whose typical diving style is cruising along coral reefs, like many other recreational divers. My wife and I did just that for a year or more after taking Fundies, and we felt the Fundies experience made our diving more enjoyable. That said, living close to north Florida we eventually made too many friends at the dive shop who were cave divers, and we got curious and eventually sucked into the cave diving orbit, but I think that's beside the point; we would have been perfectly happy to continue the type of recreational diving we had been doing for years before Fundies, only with the more methodical and, yes, team-based approach that GUE advocates. When we get too feeble for cave diving and revert to recreational-only old-fart diving, we might very well try to keep it GUE-style. I have no idea if remaining in the recreational-only GUE realm for the long term after Fundies is typical, though. My guess is that most Fundies grads sooner or later catch the advanced diving bug just as we did and end up going for cave/tech training.
I'm not at all advocating the OP would be better served by taking Fundies than other non-GUE routes to becoming a better diver. I'm merely addressing your point about GUE having a "completely different" end goal. In the recreational context, I believe GUE's goal is not all that different from other agencies' goals. For the purely recreational diver, the whole team-based diving thing really just means being a proper buddy to each other. Whether it's ultimately "worth it" to the rec-only diver in terms of the time and cost investments, where there is training and mentoring available from non-GUE sources, is subjective and individual.