Anybody sensible requires blind testing by people who allege they can hear differences that are not expected to exist according to known science.
That is the logical fallacy known as circular reasoning, or begging the question; it means the premise of the argument is used as the "proof." You can't on the one hand argue in favor of science, and then ignore it by engaging in ill logic.
Claims that do not respect scientific method have no validity.
Sez you. This is a hobbyist's group, not a scientific forum. If you seek iron-clad scientific data for all claims here, you are likely in the wrong place. If you seek change, you might begin by sharing the results of your own tests - the sorts of tests you demand from others.