AbdulAlhazred
Legend
Yeah, in DW for example there's no general move that lets a player say any old thing they want. You can, with a 7+, make the GM say something about a topic that is interesting or relevant/useful. Some playbooks might go further. The GM is also required to ask questions and use the answers. Stuff players put on their sheet, like bonds, are also binding but have limited scope. Players action declarations might also lead to fiction they're looking for.That's not to say that there aren't bumpers that serve to guide the players in a general direction in low myth games, but those bumpers emerge in play and in response to player choices, not as something the GM decides before hand.
The GM overall is still going to exercise a huge influence on the fiction and can pretty much inject elements in a way no player can.