Agreed... but Watermarking was also "unnecessary" on DVD-A's Encrypted MLP or Bluray Audio from some Labels... or on Spotify's streams, which result in an encrypted file on a User's PC or Phone?
And yet, that doesn't stop the Labels from insisting on it... as per the info above.
And DRM wasn't "necessary" either... but as can be seen from Bob's response re DRM, it was still a part of the early to mid-term discussions about MQA.
The Labels have a different opinion about what's "necessary" to the rest of the sane people in the world.