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For power users, power matters more than ease: anybody can make small annoying tunes on a piano, while one clear note is hard on a violin -- but violin mastery is worth it.
As for QWERTY versus Dvorak, all that research was from before the keyboard grew to function keys and a mouse or pad which block the touchtyper's mantra Keep Your Hands On The Home Keys. I doubt if the difference now would be nearly as big.