I currently run two Castles & Crusades campaigns. Both these mini campaigns are flexible enough that I can place them anywhere in my campaign world and few ask questions. However, future campaigns will grow in scope. I want to run Aufstrag, for example, but I am putting it in my own world, not Aihrde. The issue is that those that know the “official” lore of these large campaign settings may very well say “that’s not how it’s listed in the Codex of Aihrde” (or some other published source).
Prior to switching to Castles & Crusades and creating my own world, I previously ran a Forgotten Realms campaign for nearly 30 years through multiple editions of Dungeons and Dragons. Eventually I just threw up my hands and flushed that campaign down the toilet due to drastic world changes I hated and rejected (e.g. 4E’s spell plague and timeline jump), and when new players would say “that’s not what it says on [so-and-so] website!”
Switching to C&C means player’s don’t say “that’s not a D&D rule” because I am not using official D&D, and thus far I have been using mini-campaign settings that fit well with my own home brew world that is slowly growing over time (I have pantheons of gods that take up a spreadsheet with 7 tabs of options and powers). This change has been truly liberating! (I wish I would’ve left D&D and the Forgotten Realms behind years earlier).
But as I look ahead to using Aufstrag, and later on The Lost Lands (Frog God Games), the Wilderlands (Judges Guild), Harn, etc. I do not want to re-experience what I did during the Forgotten Realms years with player’s demanding “official” rules and lore. I want to be able to use some of these other amazing campaign settings, but I also want to be able to make changes to personalize them. But what are the chances of that working?