That's just because you have no idea what a "logical fallacy" or an "appeal to authority" is. Try Wiki, it's clearly explained. No charge for the logic lesson.
Hint: no one gives a rat's ass about your "background," or my background, for that matter, what they care about is the quality of your suggestions.
Vintage diving means that you have to consider any number of things that don't even occur to non-vintage diver.
You're right. No one cares. This whole conversation is stupid. It just keeps going because you have some kind of inner need to prove yourself superior to me, and because I am entertained enough to keep responding.
I know perfectly well what both of those terms mean. It is your grammar and context that seem not to make sense. Since you are such an expert on formal logic you should recognize it as non sequitur. No one cares about that either.
I've made several points about vintage scuba, and considerations related to teaching it that are perfectly valid and based on first-hand knowledge of both subjects. For you to attack me as ignorant is simply misguided.
I know you have lots of experience. I know you know a plenty about diving and equipment, etc. But, to climb onto your soap box and start attacking others on the assumption that they couldn't possibly have the depth of experience that you do is simply wrong, and makes you look like a jerk.