It’s a conundrum in that poor recordings exist, and the better systems reveal all the warts. For example the CD transfers of Wilhelm Kempff stereo recordings of Beethoven, Schubert, and Schumann are barely listenable on my two channel system (and the one lp I have isn’t much better bud adds the joy of surface noise). When I really want to hear them I use my mid fi systems which are more “forgiving “.
DG should remaster these to see if they are sonically salvageable