Let me interject, that I am a fan of music that has a very high level of musicianship, which often appears as very fast playing.
But, to be clear, I am not into fast playing, and high levels of musicianship for its own sake. But because I am of the opinion, that musicians with high levels of musicianship and chops. by virtue of their deep and broad musical skills have a greater potential of conveying emotional content.
In other words, the more "tools" they have in their toolbox, the more they have to pull from to vary emotional content.