This discussion has reminded me of how glad I am to have tone controls. (Go ahead, barbecue me!) I listen almost exclusively to classical music, and I seek out recordings for the music and the performance, not so much for the sound. Unfortunately, when you take this approach, you get quite a few poor recordings. My pet peeve is screeching violins. (Please, no system recommendations; good recordings DO sound good.) When things get too bright, I just dial in the tone controls.
It's not an ideal fix, because most treble controls are centered on about 10K Hz, while I believe the actual region of violin brightness is quite a bit lower, probably about 2K to 5K Hz. (That's why I wish they still made presence controls to cut back a little in this region.)
I know folks talk about all the bad things tone controls are supposed to do, but I've never heard them. I think, when needed, they fix far more problems than they might possibly cause.
-Bob