It also tells the SG not to prep a lot, which #ApocalypseWorld does as well, but it goes further and says "nothing in the game exists until a player character interacts with it", which is ... not what AW does?
I mean, it's true in the abstract in that stuff like fronts and the NPCs that come with them are built from stuff that happens in play, so at some point a PC interacted with it, but once that happened, these fronts and their NPCs can and should act offscreen, ie. without PC contact later.
Still, really fascinatin to see #TheShadowOfYesterday through the lense of #PoweredByTheApocalypse games. Once again struck by how much interesting stuff happened and keeps going on in #IndieRPG/#StoryGames discourse and design.
(Now I just need to find a good way to bring #TSoY Keys into #PbtA games a bit more. I just loooooove the idea of them.)