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In my own humble experience, “Expressiveness” is the quality of being able to bring music to life.
That said, I believe that expressiveness must unite the capabilities of the player, and the features of the instrument.
Therefore, I believe that a list such of Quetscher’s is a good way of quantifying the features of the instruments, as these are the playground for the musician.

That said, the more I play, the less I feel limited from being expressive. But this obviously takes my own setup and needs into account.