I agree with everything you've said here - but it is also largely irrelevant.
I often listen to SiriusXM radio in my car.
I like the stations, and the DJs, and I get to hear some new music without any annoying commercials.
However, I wouldn't listen to it in my living room - because the audio quality is noticeably and annoyingly inferior.
But, when I'm driving, that isn't the priority (I can't exactly sit back, close my eyes, and concentrate on the music).
I've also been known to watch a TV set in a sports bar that has a fuzzy picture and dubious color accuracy.
I agree that many audiophiles probably have a poor perspective on how important accurate reproduction is.
And I also agree that many people who don't fancy themselves to be audiphiles don't care at all.
And that goes for accurate full range frequency response, various types of distortion, and noise.
Sure, I
CAN listen to a TV show on a TV with a 4" speaker... and I can watch it on one that's standard def.
However, I will usually enjoy it
MORE if the sound is high fidelity, and the picture is high-resolution.
Obviously the relative importance of each of those things is up to each of us as an individual.
However, from the point of sound science, none of that is relevant.
All that matters is whether it is
POSSIBLE for us to tell the difference...
If we consider it to be important and choose to listen for it.
I have VERY FEW audio recordings that actually contain a 32 Hz organ note.
However, when I play one of them, I still very much want to hear it coming out of my speakers.
Likewise, perhaps only a few intruments, like cymbals, have a significant amount of high frequency harmonics.
However, when I play a well recorded track that includes cymbals, I want them there in the proper amounts.
Try it and see. I've done lots of playing around ducking out each of the octaves using an equalizer and 10-20kHz is a lot less important than you might think. We listen to sound without the upper octave all the time on TV and the radio and in the car and none of us complains. I think the importance of the various octaves is directly related to how well we can hear them.