First, congratulations. Doing a lot of diving and having fun are the ultimate goals we all have, aren't they?
My thinking is it need not be an either-or decision. You did a lot of varied diving and are, I suppose you consider yourself, now a "moderately trained generalist" as opposed to a "highly trained specialist." What I would like to add is that one of the goals of GUE Fundies is to make ALL kinds of diving more enjoyable. You can still be a generalist, but if you hone your fundamental skills, you may find yourself having more fun doing all those varied kinds of diving.The received wisdom on SB is to do courses such as NAUI MSD and GUE Fundies. If I’d followed the advice I’d read on SB I would never have considered PADI MSD as it feels like the only route advocated is to push to be a highly trained amateur diving specialist.
I think there is a misconception that Fundies is for "serious" divers only. Plenty of people who have no interest in technical diving take Fundies with the goal of making their recreational diving more enjoyable by freeing up some of their mind's bandwidth from the mundane bits (my characterization--not GUE's) and letting them focus on whatever it is that's important to them, whether that be looking at pretty fish or whatever. In Fundies, they simply tell you that the goal is to improve. The do use the word "excellence" and I think it does them a disservice and turns some people off, just as the now-disused "doing it right" turned some people off.On fundies and similar courses - I think there are a range of reasons and motivations to become a diver but not everybody wants to take it that seriously and to become an excellent diver. I’ll put it out there - I don’t want to be an excellent diver.