Again, all humans use the same rules for hearing, that is why we can use terms like deciBels and have it mean something.No it doesn't.
We are different people, with different brains, and different ears, and different priorities, and different preferences m... explains the disconnect.
I just heard a pair of Class Speaker horns. They sounded very good. Still sounded like horns.
The fact that you hear or don't hear something, doesn't mean that thing does or doesn't exist. The fact that a million people hear or don't hear something .... doesn't mean it does or doesn't exist.
Maybe I'll hear your specific horns and think they sound like quads. Maybe not. Doesn't mean they do or don't.
Many people hear your amps and think they sound, thin, sterile, or cold. I don't. Doesn't mean they are or are not sterile or cold sounding.
If you used the word 'Some' instead of 'Many' in the first sentence of your last paragraph above it would be true. Usually that has to do with how the equipment is set up rather than it being an innate property; generally because amps with a prominent 2nd or 3rd harmonic are perceived as 'warm' by the human ear.
That is due to a human hearing perceptual rule which is simply that harmonics are responsible for tone color; consequently harmonic distortion is largely responsible for the tonality any amplifier has.
I use LPs I recorded as reference. I know how they are supposed to sound because I was there when the recording was made. When I play Sound Lab ESLs, I don't hear them sounding particularly different from my speakers at home. The big difference seems to be that my horn speakers need less power. Others have commented on this as well. I am interested to hear the new Popori ESLs since they make one model that is rated 96dB. Since its a line source you have to add 6dB to that value to get an equivalent to a box speaker; how they pulled that off I have no idea.