The industry never learned from the failure of HDCD
HDCD didn’t fail, it was a great success, and worked far better than MQA and you didn’t pay for it, until Microsoft bought it from PMD ( Pacific Microsonic Devices) and then did nothing with it and let it die.
But thank god now Professor Kieth Johnson the inventor of it I believe has bought it back of Microsoft, I and is using once again in his incredible sounding 24/96 pcm "Reference Recordings", that MQA can’t come close to in sound quality.
BTW: there are thousands upon thousands of HDCD recording out there, many of which are not labelled the the HDCD logo.
Cheers George