Note: This is an old draft, slightly reworked. I think it makes some valid points, but I'm doubting the distillation argument a bit. Concretely, it now seems to me that what is actually reducing overhead is presenting lore through things that the referee can relay verbatim to the players, or that the players can read themselves in the book. If this is true, it also includes less-spectacular things like boxed text and actual lore sections. Because of this, I've added a note on how distilling l...