When you can't measure and you can't or won't hear a difference, you say it's snake oil. It's fair but while others say they can hear a difference, don't say they are wrong coz it's their ear, you wouldn't know.
The measurements we do are mostly on frequence domain, while sound quality difference we perceive depends on time domain largely. Right? Or it would be so easy, just to buy the one with best/better measurement result always and problem easily solved, but you know it's not that easy. What I am trying to say is that we haven't figured out all the objective measurement to explain how we perceive the sound difference yet.