Re-issue, CD, SACD, Tape....LP....and what studio tapes are being used....

It would seem that the original tape from the recording session is one of the most important parts of the sonic quality.  Tapes that are copies or generations removed from the original would seem to always suffer some loss.  So it would seem on classic recordings up into the 70s having the first generation of the studio master tape would be an important factor.   Of course the loss those tapes might suffer with time is a topic as well.   But of course...with digital we now have "perfect sound forever" ....so no need to think, just consume.