I agree with all that has been said. For me, the trouble is that "emotion" is a blanket word covering a multitude of mental states. For instance, as I am getting older, I frequently find myself in states, especially during improvisation, which the word "emotion" falls far short of adequately describing. Nonetheless these states are supremely important to me, and constitute most of the reason I play at all. Is immersion in spontaneous abstract beauty to be considered an emotion ? It isn't in the usual associative sense of the word, but it is becoming practically everything for me lately. Technique, physical, and more importantly mental, certainly facilitates the release of a wider variety of abstract beauty.
So for me, yes, technique (not in the trivial, show-off bravura sense though) plays a vital role in generating forms of abstract beauty, if that be construed as "emotion". It can, and frequently does happen that way around. I hasten to add that this appears to be a process of late middle-age, and that when I was young, technique was a tool to express emotion. Perhaps this happens as hormone levels decrease.