Without being negative and just bitching, doesn't it seem a shame that the great analog pressings, UK, Classic etc. of all these albums seem to be universally considered to sound better? Why even bother with digital in the analog mix at all. Fine to do a hi res file if you want to offer options, but why add a digital mix when obviously the all analog sounds better when done right? It's just lame to me. I guess we live in a world where mp3's on Beats headphones, McDonalds, selfies and Facebook is as good as most people want. Sorry, I couldn't help being negative and just bitching :)
it's very simple.
the rights owners of these recordings make archival digital copies for remastering. they won't allow the original masters out of their control with rare exception. and then it's with heavy guard and at considerable expense.
this perspective is many times combined with a lack of understanding of the limitations of the digital archived file.