[hesdeadjim]

Goals have to evaluate their preconditions/etc and depending on your game to do so might be expensive. If a precondition for a goal is that a place in the world is reachable, you'd need to be able to run a pathfinding query to satisfy it. Other game systems might have bad Big-O as content gets added. The mission availability system in our game is one example, as we doubled the number of quests and NPCs post-launch and had to do some optimization.