You're preaching to the choir. But you asked why some of us keep saying "it's not for everyone." I know several divers who want nothing to do with the kind of gear I dive in.
In the scuba Utopia I envision, everyone receives their OW training in a BP/W and stiff paddle fins, and they live in blissful ignorance of any other way.
In the scuba Utopia I envision, everyone dives safely, does not negatively impact other divers and we all live in blissful pleasure of the experiences and sites underwater.
In life and on a recreational dive boat you meet all kinds of people. Are they polite, do they dive safely, do they negatively impact my dive ? I really don't care what kind of gear they use. I've met a**holes in jacket BCD's and BPWs.