The GM doesn't know, in advance, what actions the players will declare for their PCs.
- Play to watch the world unfold
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I can't really think of a better phrase for why folks choose to play such a style beyond wanting to see the changing state of the fictional space. In theory, that's the part the GM relinquishes some amount of control over, in order to permit player agency--they don't actually know what will unfold. They know the processes, but their knowledge of the inputs is merely vast, not 100% complete, as player choices are also inputs. The issue comes down, more or less, to the GM simply choosing to refrain from exerting more than a certain degree of control, control up to a point and no further
This is where the variable input comes from, as you say. But what is the heuristic that processes those inputs? It does seem to be hard to pin it down!
Part of "not being a jerk" seems to be to not gratuitously muck the players about - which seems to mean having some regard to what the players are looking for out of the game - which would seem to be "meta agency" as that has been characterised.I just...don't really see much in the way of tools or techniques to help with doing that beyond the nigh-useless "don't be a jerk/don't play with jerks"
But "meta agency" also seems to be renounced by those who coined and have embraced the phrase. So it's confusing.
This is part of why I think that "meta agency" is a pseudo-concept. Everyone has to have some minimal regard to the fact that they are GMing for a game. A system like BW sharpens that up and focuses it to a much greater degree, and we can talk about that matter of degree; we can also talk about the extent to which having that sort of regard reduces the capacity of the GM to simply give effect to their view of the world.
Introducing ostensible taxonomic categories, like "meta agency", just gets in the way of the practical analysis.
I think a big (or at least not small) component of the decision-making process is intuition.Robertsconley has spent, quite clearly, a lot of effort on trying to work out such techniques, but unfortunately it really does seem like a lot of the end result is "I have to pass my intuitions on to you through direct teaching; they cannot be discussed in any meaningful way" which is...well, it just loops back around to the difficulties with vague handwavy terms and the idea that the only useful techniques are ones which can never be spoken about separately, nor examined afterward, only demonstrated in the moment, fleeting and ineffable, until the acolyte acquires the same intuition seemingly by revelation.