@bored I don't have the creative juice anymore for that level of world-building.I just don't.
To expand: The HM stories based in IP (Alien, for example), I had WAY less questions of world mechanics, whereas all the original-theme stories I ran were CONSTANT floods of questions on the most random and tedious of things no matter how much theme I'd written and a number of players would get frustrated and freeze up because they didn't know what they could do. At least with an IP framework I can give easier, faster answers and not have to develop as much from scratch.