This is not true of AW. It does not "ultimately come down to" what you say it comes down to.PbtA games take a very different approach than D&D does but it still ultimately comes down to automatic resolution, randomized resolution or using some resources.
Here is a very brief summary of the AW action resolution rules. Fully spelled out, the rules take up probably about 10 pages, maybe 20.
There are rules that establish who gets to say what happens next, and what the parameters are for what they say.
In general, the GM gets to say what happens next, and what they might say is established by the list of GM moves, and in general it is to be a soft move.
If the GM has already made a soft move and no player declares an action that might stop the trajectory of events coming home, then the GM is entitled to make as hard and direct a move as they like.
And as an exception to the general rule, if a player declares an action for their PC that triggers a player move, than that move is resolved. On a 6- result, the GM can make as hard and direct a move as they like. On a 7+, the rules for the player move establish what happens next, or who gets to say what happens next and within what parameters.