Tension between the old/familiar and new/unrecognized music in performances/recordings
So two things are simultaneously true:
When an orchestra decides to program a Beethoven/Mahler/Bruckner/etc. cycle, some people complain about not needing yet another one, about old stuffy music (maybe insert something about dead white men).
Performances and recordings of the above attract more concert goers and listeners than new or rare music, by a long shot.
As a listener, I'm always happy to give new music a shot, which I think should be part of the job of a balanced classical performer. But at the end of the day, classical music is kinda definitionally the music that has retained interest across the centuries. Of course there are shifts in what is appreciated, meaning there is also room to promote music that could end up moving more into the standard rep. I'm personally always a little irked by the dismissiveness of the old classics, though. It's the center of classical music and always will be. So sure, don't check out that new Mahler cycle if you don't want another one. But no need to be snooty about it, either.