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

I have come to enjoy Jay's thread and videos. This thread was inspired by my repeated request that he use acoustic, little processed content.
Even with his use of digital only, his high quality playback system will surely reveal significant and pronounced differences between components best with acoustic music. 

Jay's amplifier thread is all about evaluation/analysis.

Obviously, recording music is an electronic process-mixed and mastered. However, many recordings clearly strive to recreate the real, original sound. I would point to “Audiophile Recordings” which, mostly, are acoustic and “natural”. Surely, such recordings are sweetened and adjusted but the goal is a natural SQ.

I think what you are saying is that it is all relative. I listen to no rock.
I don't listen for impact or excitement. I want to hear a relatively clear sound.
Speaking of tweaks, I will always remember your raves about Townshend Podiums. The difference between the SQ before the Podiums and after is that I entered a new world of clarity, relatively.
Could I also hear that with rock? Sure. But I have no idea what an electric guitar or electric bass sound like... relatively speaking.
I have the good fortune to be involved in the design of what we hope will be the world's best upright bass amp. Our goal is to make it sound as much like an acoustic bass as possible. Considering the challenge of having to go through an electronic recreation.

Martin or Gibson guitar?
Strat or Les Paul?
Normally, an acoustic guitar player does not electronically alter.
But, perhaps an ultimate test is whether or not a piano sounds “right”.

edcyn
I own a '37 Gibson LOO! It belonged to a Vaudeville performer named the King of Strings. And boy, is it...
Not all Martins are as described. The dreds more so. I also have a sweet 017 Martin. Also spent many hours at McCabes.
Used to have a Santa Cruz Tony Price Pro. Great Brazilian. But I prefer the older small ones.
Many pianists say that a Fazoli piano is the Rolls Royce.