You are still misunderstanding. Whether one person, or a hundred people makes a claim, they are still individuals making a claim, and it is their specific claim that is being refuted.
I could design a perfect experiment to test some "tweak X" in general. I could assemble the best system on the planet (for testing "tweak X"), put it in a space perfectly designed for acoustics and that specific system, and then pick 100 of the best "golden ears", with extensive training in listening tests. I could reach the perfectly clear conclusion that the use of "tweak X" was completely and totally inaudible. Result: If "tweak X" was popular with a certain set of audiophiles, those audiophiles would be running here as fast as their keyboards would allow to make up any number of excuses, yes excuses for why the test was not valid. Just look at the excuses suppliers will make for not doing controlled listening tests ....
It is far more useful in some contexts, personable, and actually far less prone to error to prove/disprove specific claims made by individuals, whether about themselves specifically, or a readily identified group, as the claim is very tightly bounded. Prove enough of those specific claims false, and you accomplish more than a well controlled test.
Oh, and your comment about me being "new to the forum" was, to put it kindly, misplaced. This is not the only audiophile forum/gathering place on the web.