Campbell
Relaxed Intensity
this is one reason why the fiction is a problem as a term: can’t you see how it plays much more strongly into story now rather than sandbox? And it is because the term
You might have a conception or model of what the greater setting might look like (I do when I run sandbox games) you use to inform the judgments you make as a GM, but that's not the same thing is a shared imagined space or shared fiction. It's impossible to play a shared game inside a mental model or conception that exists in one person's head. We play inside what game designers call The Magic Circle, our shared understanding. When we say something is established in the fiction we mean the shared fiction, not the GM's conception or mental model of the game's overall setting.
So I think what you are probably objecting to here is more the perceived elevation of the shared experience over your personal experience of your mental model. I'll admit to that. I think everything we do on both sides of the screen regardless of playstyle should be in service to that shared experience. That we play for each other, not ourselves. It's also what we all RPG shares, that here and now of the shared imagined space. Once you leave that shared space behind our ability to have a conversation about play that is amenable to a discussion of a variety of play paradigms becomes less viable in my opinion.