From the causality and relativity discussion, it seems like you could do some really neat stuff. Like for instance, you could generate a random encounter with an NPC, and a history of events for that NPC that includes causal chains initiated by the player in the past. Because everything is relations, and you know that the NPC is present now, and we have a history of all observed world state and actions, we can work backwards to get an entirely consistent history for the NPC without having simulated it in advance.