That been said, one point that I feel is critical to this debate and perhaps the ultimate arbitrator, is humans’ hearing physiology and how the brain processes the sound.
Right. One point that has been trumpeted by @atmasphere is how humans perceive distortion, but most egregiously so at the higher odd order harmonics. Glad to understand he designs his products with that (presumed correct) fact in mind. Unfortunate though that manufacturers do not include this type of data in their specifications.