The agencies that certify such training....SDI and PADI.
It is a sort of community-based, evolving, set of best practices. For example avoiding kicking over stands of pillar coral. It used not matter very much...now it is a serious no-no. You, for example, do not have the right to do that if it greatly infringes on my enjoyment of the dive site, not to mention the hundreds/thousands of divers that do not get to see that pillar coral. So it's not really an opinion; it is rather a set of best-practices about conserving the environment.
Agencies that certify such training have proven to anyone that wants to open their eye that they couldn't care less about safety, just about mass certification. I would admit that some instructors within said agencies do care some of them care deeply. Doesn't matter, there's more ways to arrive to safe diving besides going thru the agencies, takes longer but it works just as well.
You follow community-based, evolving practices. Others follow self-based evolving practices.
100% agree with protecting the environment. I care about my dive sites very much, I would turn in anyone I see poaching.
But did you mean the environment on your OP? it sounded to me more, way way more on the training and equipment.
I got the training I felt was sufficient in the format that suited me, may not be the training you chose for yourself, who is to say which training is superior?
We don't know each other, but I can almost bet that your gear is greatly different than mine, even if we both use a backplate and wing. I also get the feeling that you would disapprove my gear for my typical solo dives, and you have the right to disagree but keep it to yourself because I don't really care. I certainly couldn't care less about what you use for your dives, and that's the way it should be... Unless you know me and ask for my opinion or if I ask for yours.