Manbearcat
Legend
So there's been a theme running through many of the responses around sandbox play, which is that the goal or notion of the player only "playing through their character's viewpoint" is of high, nearly paramount importance.
There seems to be something fundamental about "actor stance" for sandbox play that while I don't really have a problem with it as an agenda, it doesn't really line up with what I've experienced in 30+ years as a player.
However, as a topic it doesn't seem to directly relate to the OP around GM prep / notes / setting prefabrication, so maybe I'll bounce it into a separate thread.
This is true. They’re distinct priorities.
As I mentioned upthread, the bulk of my play in TTRPGs has featured Sandbox (or Hexcrawl) play whether it’s RC, Dogs, AW/DW, or even Blades. Each of those are subtly (or more) different from each other.
However, one unifying aspect of all of them is that “stance pivoting” is a prominent feature of my games.