So I take it you don't believe Shannon Nyquist and further don't wish to bothered by examples that it actually works.
I guess that some who have decided that CD cannot work optimally from what they hear in actual CD reproduction also have decided that therefore the theory of the medium must be wrong.
Yet that is demonstrably not the case. This leaves only issues with practical technical implementation of the medium (which arguably are harder to solve than with so-called hi-res media), and even that is getting better and better, to the point that even committed analog fans are becoming convinced of SOTA CD reproduction.
I am repeating myself here, but Peter Breuninger, for example, states in his review at AV showrooms about the flagship MBL combo (the transport is CD-only):
"The MBL 1611F D/A Converter and the MBL 1621F Transport represent a state-of-the-art attack on the best sound that digital audio reproduction offers today. Together as a set they produce the most analog like sound this audio reviewer has yet to experience from a digital front end. Ordinary 44.1 kHz Redbook CDs become as smooth as SACDs with the air and life you would expect from vinyl. In fact, the MBL combination is as satisfying as one of the best analog systems in the world… the Onedof turntable, Triplaner, Ikeda, and Zuzma 4Point arms, Ikeda 9TT and Phase Tech P-1G cartridges into the outstanding Wyetech Ruby Phono Stage. That’s a $170,000 analog system!
The MBL 1611F D/A Converter and 1621F Transport… it’s analog on a silver disc!"
From:
http://www.avshowrooms.com/MBL_DAC_Transport.html
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And I would not argue with this assessment until I would have listened to this kind of CD playback myself. Unless I am dogmatically wedded to my preconceived notions, of course.