I don't think the difference in the key action has much to do with appropriateness of repertoire. Most top tier pianos will have a similar feeling action if the

I don't think the difference in the key action has much to do with appropriateness of repertoire. Most top tier pianos will have a similar feeling action if their regulation were all attended to by a top tier technician. The construction, however, does have a lot to do with how repertoire sounds. Bosendorfers and their all-spruce construction causes more warmth and resonance, useful for traditionally played baroque music, but can lead to a blurriness in romantic (i.e., Chopin-era) music. Contrast with a Fazioli or Steinway which have a little bit of a tighter tone due to their hard rim cases.