The one thing that really annoys me about subjectivist BS is this reflexive descent into hyperbole at every opportunity. Every change in the system (at least every one that involves spending silly amounts of money) supposedly launches the listener off on a transcendental voyage of revelation.
I can sometimes spot the difference between, say, a well-designed solid-state amp and a tube amp with a mediocre SINAD, but boy, it's subtle and I have to be in the right frame of mind to isolate the differences. I can spot the differences between speakers or headphones with clearly-differing frequency responses, and that's a lot easier. But you can bet your bottom dollar that when an audio reviewer comes out with "the differences were not subtle ... the [soundstage, texture, warmth, whatever] were massively improved," then the chances of you actually hearing any difference are nil.