The reality is that all the internet discussion can't really compete when the needle drops or the play button is pushed - If Amplifier A or Speaker A generates a Gestalt sensation when listening to music and amplifier and speaker B do not - then how do you expect a person to throw out the listening experience and say - well I read a white paper that says speaker B or amp B is superior so that's it - that's the gold standard - forget any listening experience - that experience is just you being affected by bias.
If they are at all interested in listening to what the source was expected to sound like, that's exactly what should be done.
Otherwise if they're just interested in something that sounds good to them, they have every right build a rig that does that.
The fly in the ointment is if you build a rig around parts that can deliver true accurate HiFi, you can always add in a little something here to there to add those pleasing but distorted effects.
If you build a rig using a bunch of "sounds good to me" stuff, you will never be able to use it to hear the true HiFi playback. You're forever forced to listen to the tone controls you chose.
And it almost always comes from people who have never bothered to actually listen to stuff. I get it - I used to say the same things. Tubes suck - look at the measurements. That speaker sucks - look at the measurements.
A typical subjectivist mis-statement. I don't know anyone of a scientific bend in this hobby that doesn't listen and pay attention to the sound of music delivered by his and others gear. But if component A delivers truly audible bad measurements, it sucks, that's just the fact of it. If you like the way it sucks, that's up to you. But it still sucks.
I really think this is something we've actually proved false and another opinion we should count as misinformed. On top of what we usually say—that at least as far as playback gear is concerned we shouldn't worry about distortion audibility—we also shouldn't spend time considering what character could given to the signal by tiny spectral fluctuations. The levels of noise/distortion that boutique manufacturers advertise are squarely in the realm of inaudibility, and the "distortion character" thing is another product of the hearsay passed about in the overall community.
If it's audible, it's audible. If not, then not.
But we discuss many components who display very audible&measureable distortions that some people love. Do I really have to list them here? My original statement remains true "Some people love the sound of various distortions, this is a lesson we've learned over and over."