David, my point is we surely all feel our systems are natural. Now others might visit and disagree. But noone is starting off by saying their sound is anything other than natural.
For me, the word is as confusing as it is helpful. Its like saying something is "good". Why is it good? What makes it good? Why is something else bad?
For me, like Peter (to a lesser extent, we live in a quieter place for live music), I also use unamplified acoustic concerts as longer term measure.
Natural as a word I find less than useful, and polarising. But timbral accuracy, tonal discrimination, texture and density, these are all heard live and aspired to by system changes here, as I'm sure they are at Peter, and many more of us. And obviously heard at the best demos (Audiophile Bill's horns being the greatest example).
I feel I've made great strides on aspiring to the qualities listed above. I guess I'm gonna have to use the word natural more often as well Lol.