How can a system be judged with highly processed, non acoustic music?

Acoustic guitars also change over time and some are better than others, in fact much better even among the same models of the same brands. A late 30s Martin D-18? Astonishing or unplayable depending on the guitar's life over time...Richard Hoover of Santa Cruz says you gotta play the things to make 'em great.

Just a note...Nobody can tell the difference as Gibsons and Martins can sound very similar or dissimilar depending on the tone woods, age, model, manufacturing techniques, etc. I've owned and played both brands extensively for decades so I know what I'm talking about. In real life. What does an Olsen sound like? A Bourgeois? Froggy Bottom? Santa Cruz? Also, if you're a huge hippity hop or EDM fan you might have discerning tastes regarding the sound of that even though it's not "acoustic." So what? Mic cables, mixing boards, ear wax, microphones (first Stereophile test CD had a great thing where somebody read into a bunch of different microphones...check THAT out), engineers, the acoustics of a live venue, the engineer's ear wax, on and on all have a big influence on recordings. If it sounds right to you, whatever you're into, it's right.