And likewise there is no tangible proof otherwise.
Over the decades usable listener patterns absolutely have emerged and have even been cataloged.
What has
not emerged over the course and history of formal science is evidence that an
absence of data is a marker for there being no observed phenomenon. Also, ignorance of X does not nullify X or the scientific endeavor would vanish.
I don't think I've seen the results of a properly run, double blind listening test, that conclusively proved that mains cables made a difference.
"Properly run" really begs the question. Meanwhile we have those patterns of use and to credibly refute them you'll have to credibly cite your work that humanity suffers a wild myopia or the objectivist's favorite fallacy, an outright mass delusion driving us to such parallel conclusions.
If there have been I bet they haven't been systemically repeated with the same results....If you can find some peer reviewed cases many people would be ready to change their views, me included. We are all ears
Not as far as I've seen. Demands for these magical proofs built on clinical testing apparatuses are as rife as they are preemptively intolerant, not just of the listener but for the formal definition of science.
You're fighting a huge amount of measurable evidence,
I am?
with no collective, repeatable evidence to counter it in an area that isn't at the very edge of astronomy, or high energy particle physics where theories abound.
Anyway...
The armchair objectivist doesn't even grant the complexities of electrical grounding structures in nested components. The (in)audibility of distortion per location, type, spectrum, and magnitude. The complete nature of loudspeaker behaviors. The audibility of active circuits. Of passive components. And on and on.
In 2024 we live in an era of measurement bias, where assumptions about data and the limits of that data compete for objectivist favor when neither even have, to use your word, a proper working context.
This has been known for decades. Also demanding that forced clinical competition trials overrule a century of regular, natural user progress along fairly repeatable, working terrain isn't a compelling position.