And this is a truth. I am such a one, for a variety of reasons. I am also careful to consider measurements (defined widely) for a component's attributes, again, for a number of reasons.
Me too @noske - my tube preamp has the 2nd at -75dB the 3rd at -90, and the 5th at -110dB.
My old preamp was predominantly 2nd harmonic.
My latest power amp is not too dissimilar - just a bit higher…
And the older tube amps predated Stereophile’s use of the AP test gear.
So they all look like what Ralph is describing, just we cannot see it.