I say show me the measurement. NOT a subjective impossible to quantify.. "my ears or my ear "training" or my sense of hearing are more evolved an better than yours" like most claim.
Careful waving around demands like that. Asking an audiophile who tests claims purely subjectively to show objective evidence is like raising a cross to a vampire ;-)
(Especially many of the tweak-manufacturers, where you get pseudo-scientific sounding descriptions in the sales pitch, but in place of objective measurable evidence for those claims, you tend to get marketing and anecdotes. Which makes business sense, given the rich market resource they have of largely subjectivity-oriented audiophiles whose methods of 'testing' the claims allow for all the bias necessary to hear what the marketing pitch suggests. And I count myself among those who have been influenced this way).