Just another understanding of the question:
In teaching/learning techniques, do you teach train first "gaining advantage" and then the flow comes by practicing hundreds of times or do you teach/practice mainly the correct movement and blending - maybe dancing - and when you are improving on those, nage will gain advantage/control over uke by time?
Using this interpretation my answer was as stupid as it can be: Somewhat important as neither extreme is right.
But it might even depend upon the level of experience.
I would say it is a good question as neither the answer nor the interpretation is prefixed. Maybe such an open question is not ideal for a poll