You make excellent points about the rigor that must be applied to testing as well as other potential issues. I suspect most of us are at an age where there are not a lot of golden ears in the group.
I'm most certainly not an ASR follower. I've invested in relatively high end cables, a good DAC, etc., and I generally believe that electronic components matter a great deal. I don't, however, dismiss Amir, Gene, Erin and other objectivists out of hand nor do I have an emotional response to their point of view because it differs from mine.
I'm a little closer to agnostic particularly when it comes to some of the cables, switches, etc. What I know about science wouldn't fill a thimble compared to some of the EEs on here but I know a little about business. I know that if a cable company-pick any of them-set up a juried, independently verified completely professional blind testing that was seen as unbiased with no room for tricks-ABX-whatever-and filmed it live and if the participants in statistically significant majorities picked their cables over competitors, or even much cheaper cables, switches, etc, that company would experience a great surge in orders and would reap a big reward. These companies are run by rational business leaders. It bothers me that as far as I know, none of them do that, because why wouldn't they? I'm not an "objectivist" but that bothers me.
Not looking for a fight-I'm happy for folks who find products that enhance their experience even if its buying rocks to put around the room-whatever works for you. Its an interesting question though.

