As far as the distinction between helping to build the narrative by invoking mechanics that resolve your own character's specific actions and invoking mechanics that build the narrative in ways outside the character's knowledge or power to affect... I'm not sure how useful a distinction it is. It seems like both are going to be needed in any RPG.
For instance, casting a Wish spell to alter a character's race, sex/gender, age, social class, or innate talents, vs you determining those same traits for your own character at chargen by making choices and using a point buy system to get your stats.... In both cases you may be dictating not only things about the character, but, like, who they're parents were.