But surely you have a core repertoire?
Sure, I have as much core stuff on the plannning as unknown stuff. It just takes much longer as there is so much to live up to. I keep diligently working on my WTC re-recording for example.
In my case I find that, maybe due to tecnical deficiencies, I always have something new to find even in the oldest pieces. I believe it is only now I can actually perform some of the music I first learned 20 years ago. Now, if I tell you my playing of Mozart, Schubert and Beethoven has improved by learning Rautavaara you might raise and eyebrow (or even two or three!), but this is just what has happened.
Absolutely, playing modern music hugely increases one's overall abilities and resilience. Personally I can also say that my playing of anything has improved dramatically because of practising lots of Bach.
I believe many of us here fall into the recording trap, where we no longer perform, but record and once it is recorded, we can forget it. After all, we can always go back to the recording, can we not? We are no longer interested in playing: we want to record and to record what has not been recorded before. These days if one wants Ismagilov, Suk or Ishikagawanapanitupitaminovit this is the place to be, but if you fancy Mozart or Schubert...
An interesting conjecture. I think you are right to a certain extent. Discovering and recording something new for the site, has a definite ring to it, more so than providing the umpteenth version of the Moonlight or Raindrop. But I object to the notion that we are not interested in performing. Every recording is also (or should be) a fine performance, even if has seen some post processing within the limits.
I think our site has a healthy balance of core and specialist repertoire but I would urge everybody to try both.