CD's 44 KHz playback can only (perfectly) reconstruct signals at 22 KHz. That is inadequate for _some_ people. Why do you assume everyone else is just as tone deaf as you ??
Ah, now we get to it. You're not a science crackpot on sampling (though apparently on Einstein???), but you believe in humans with super-human hearing. I, OTOH, believe in audiophile salesmen capable of convincing the mark he has super-human hearing in order to drain him of $30k for audio equipment.
Sure, sure, it's a bell curve and a few can hear above 20k at birth, though with significant attenuation, but it won't last long.
Some people (incorrectly) believe you can't see frame rates higher then 30.
No one who saw the HFR version of the Hobbit, or turned on the "make everything look cheap" temporal up-scaling in their smart TV believes that.