has there been that many blind test done? it definitly requires more time and proper setup, organizing. measurement are important and love them as a reference as to what to expect for sure, but dont believe they are be all end all, i wish anyone of you lived nearby here and we could do real blind test (in quebec, canada). i understand the psychological involvement, even when your tipsy, high, sober, relaxed, depressed, happy, anxious, tired, etc.. you will perceive sound differently. which is why measurement are an excellent common ground and reference for said component.
having said that, i mean there cant be that many crazy people comparing dacs and different sound, espiecially when there is a lot of common ground between different people and audio equipment(referring to real people, not paid reviews etc).
also, going with your argument that of "confirmation bias", whos to say that your way of thinkin and confidence of that thinkin indirectly forces your brain to not hear a difference between components, even though there is?