Well, there’s really a moment where it can get… problematic. It’s when it gets out of sync with the fiction.
But in the general situation, I see following sheets and moves being “how the game wants to be played”. I mean, if the mechanics are done the right way, they’re pointing me to the fiction the game wants me to tell about, so I don’t care so much about “mix/maxing”. Let the game flow with its own fiction.
The game has mechanics? Let’s put yourselves in his hands: powerplaying/mixmaxing will be the best approach, as in any other game.
Fictional positioning being one of the basic mechanics that should be understood and used and explained in the rulebooks. It’s too much underestimated.