The piano's outstanding characteristic is its overtones.
The instrument's rich sound is magical and defies repetition.
All those piano instructors insisting on repetition have it all wrong - they still haven't figured it out. Is it too frightening?
At about the same time as the piano was invented visually transmitted information was on the rise in all kinds of fields - the new field of Visual Culture has tracked this, I am not making it up. Notation took over. Magic? No, thanks.