I never trust any statement involving human interaction that leaves no room to incorporate individuality. What you're saying is that every guitar player with an experienced ear will always agree, from guitar to guitar, which sounds better and which does not. I disagree. E.g., There's a guitar store I go to that is run by trained musicians. I was talking to two of them about a particular Gibson J-45 and was pointing out a weakness I felt I was hearing in the sound. Both of these guys are always honest with me. I've been buying from them for many years and I know them personally now. They each give lessons and actively play professionally besides working in the store: these aren't kids, they are all in their 50s and 60s; one of these guys has a MA in music. Neither of them could agree if they heard what I was talking about. One thought he did, the other said flat out he did not. We couldn't agree on much of anything. I was on the fence about the guitar, one of the other guys liked it, the other guy said he thought J-45s all sounded kind of dull to him and thought I should be looking at a Martin D18 instead.