Mick seems like he misunderstood, or wasn't properly informed, of the scope:
After reaching out to Mick several times via email to understand what prompted his online posts, we were able to talk. He shared several issues that I'd also like to address.
First, he said that he was surprised by the scope of what was released – the 59 tracks. Chad had sent Mick everything more than a week before the final deadline, and I described to him our plan to combine the id-edited tracks with his own tracks (as he'd suggested doing). The tracks Mick delivered covered only a portion of the music in the game, so the only way to deliver a comprehensive OST was to combine the tracks Mick-delivered with the tracks id had edited from game music. If Mick is dissatisfied with the content of his delivery, we would certainly entertain distributing additional tracks.
I also know that Mick feels that some of the work included in the id-edited tracks was originally intended more as demos or mock-ups when originally sent. However, Chad only used music that was in-game or was part of a cinematic music construction kit.
Seems like id asked him to master 12 tracks, he said "no problem," and though it was going to be like a motion-picture soundtrack where he was just going to master the most notable music, but id wanted to put out a soundtrack featuring literally every bit of music that appears in the game.