it isn’t a category error and calling it fiction missed the point of play in this style. Look, I can imagine a small town in my head with residents, a layout and geography. This place exists in my mind external to the players. And the players can explore it in the game. The point of contact is what I and others are calling the energy, the synergy. You seem to be using a term to invoke that and the town in question (ie you are folding the world into the fiction). But these can be two distinct things: one the shared experience the group has as they play in the town together, the other the mental model of the town in the GM’s mind.
No one is saying it is a thing in the real world. What people are saying is you can map out a world, run a world, so it exists outside the players as an idea that is explorable. It is not unlike the notion of exploring a setting made for a video game, with the additional element that the human GM is there to add an additional layer of flexibility (i.e. the game might not be programed to allow for it, but a GM can help facilitate what happens when you try to pick up the rock by the bridge or kill the shop keeper).
The issue is, even if I accept that the "living world" conception can exist as an idea outside of the "shared fiction taking place at the table," it's only explorable by the GM. Which is lovely for the GM, to explore the wonderful conception of the world they've created inside their own head. And lest you think I'm being overly critical, I've done it myself, dozens and dozens of times. It is a lovely experience to spend time inside my own headspace, imagining and dreaming of this fictional place I've generated.
But the players don't get to explore that conception. They only get to explore the game fiction happening at the table in front of them. The sole, single, and ONLY avenue the players have for exploration is through the parsed-down version of the ur-"living world" being given to them through the GM.
I understand what you're trying to do with the video game analogy. You're trying to separate, for example, the actual in-game play of
Skyrim---the things players see and do and interact with---from the source code that powers the game.
Player stuff = "the fiction at the table,"; source code = "The GM's conception of the living world". And on a certain level, I can kind-of, sort-of see the the connection.
But isn't it also fascinating that
Skyrim is hands-down the game that has been modded more than any other game in the history of video gaming. And why is that?
Because the players want to experience things that its original designers never thought of in the first place.
To take the software analogy further, the point of agile software development in today's world is avoid having to do huge, monolithic source code builds and then "waterfall" them down. The goal is to build a minimum viable product, get acceptance from the users, and then iterate from there. Which, oddly enough, is pretty much exactly how Ironsworn and Dungeon World prioritize world-building.
For me, I finally just realized that the conceit of the "living world" is fraught with peril for RPG play. As
@Aldarc noted, there's a mysticism, or a romanticizing about the concept that too often gets abused by GMs the world over to create sub-par gaming experiences.
And when I use the word
conceit in reference to the notion of a "living world," it is very much intentional. I've spent a great deal of time analyzing my own experiences as a GM trying to run a "living world" campaign (which I've done six or seven times now).
In those analyses, I realized that if I was being 100% completely honest, that there is a level of
conceit involved. There's an inherent hubris---perhaps mild, and ultimately harmless, but hubris nonetheless---in believing that my conception of the game world is so amazing and precious and special that it's worth being explored on its own merit.
And I know you've said that you don't really feel your world is all that "precious" to you; that you try to downplay and curb that instinct.
But isn't it still there? Just a little?
And in doing those same analyses, if I was likewise being 100% honest, the things the players cared most about were the things
they actually interacted with themselves, not the "hidden backstory" or "living world" elements.
Player engagement happened when they
had something to care about within the shared fiction. And yes, creating a massive "living world" construct prior to play certainly gives players lots of potential things to care about. But it also gives fuel to the GM to railroad or override things the players care about. Or maybe the GM picks the wrong things. Or maybe the players don't really know what it is they want---they change their minds 1/3 of the way through the campaign, and now everything from Session Zero is now null and void.
If this is insufficient for what you were seeking, fair enough. I am a little perplexed though that an argument or a syllogism would entirely change how you experience the game. That just isn't how I think at all. Do I like this game? Yes or no. Do I feel like I am exploring a world external to myself? Yes or no. That is all I really care about. The GM's job here is to create the sense of a real world, not to create an actual world. But it is an approximation that can really feel real, and the GM can cultivate it as an external in his or her imagination (which is external to the players). I think when you keep describing it as 'the fiction' you miss on this aspect of exploring what is in the GM's head and what they understand about the world, as well as the interplay between that and the PCs: and the energy that flows from that. Now if that is too wishy washy, too mystically phrased for you. By all means, go play another game. Some of us take a somewhat mystic view to conceptualizing how gaming works and it totally works for us. To me it isn't particularly important if you accept these worlds as real or not
The point of the syllogism was that I was being dishonest with myself about how I was prioritizing the prefabricated "living world" elements. If everything is a construct---even the "living world"---then what matters is what is considered true within the shared fiction. And why were my prefabricated "living world" elements receiving privileged status as in-fiction "truth"? Only because the natural asssumption is that it's the GM's call to say so in the first place.
And if I was truly interested in the enjoyment of my players, that I had to be willing to let go of that conceit.