LIKEWISE: no one can possibly know whether a new addition (ie: some kind of disc, crystal, fuse, interconnect, speaker cable, etc) will make a difference, in their system and room, with their media and to their ears, without trying them for themselves.
That’s simply false.
In many cases, we can absolutely know that there will be no audible difference made by some tweak, cable etc.
To think otherwise is basically scientific and engineering illiteracy.