100% agreed!
For the past couple of months I have been preoccupied with thinking about the smooth flow of play. The moment that everyone who plays-to-find-out experiences, when after a while the game just catches and all of a sudden, Woah! we're going somewhere! We have momentum, and events are flowing from our lips with direction and purpose. I think that what you've outlined here is a crucial element to understanding exactly what's going on when that happens.
You don't get that smooth flow of play and purposeful direction unless the game addresses itself to the smooth and purposeful flow of conversation. But since we're making this up as we go along, and we can guess but never know for certain what the next move could be, there's always going to be gaps and uncertainties in the conversation. And those moves which give you a positive and active role in shaping the conversation can only really come into play if you already feel more or less certain about the conversation and the grounds on which you invoke them.