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Actually the piano is one the least versatile instruments. You get control of which key you press, a chosen velocity and the sustain pedal. A piano performance can be midi recorded using these three values and reproduced in an extremely high level of detail. If you try to do the same with a truly versatile instrument like for example the violin you will find that it is impossible. Not difficult, impossible.
I'm confused. Isn't it evident from the rest of my comment that I agree with you?
(On an unrelated note: I think my upvote button has vanished. Otherwise I would have clicked it for your post!)