A person building a world may have put in a lot of work, written a lot of background, and then become stuck with a particular problem that depends heavily on that background.
If a problem is such that it is necessary for someone to read and understand a lot of that world's background - which may be too voluminous to post on SE without a link to a document stored elsewhere - is it still a good question for Worldbuilding SE?
Should we have - perhaps as a Community Wiki - a question that asks Worldbuilding SE users to post some details about worlds that they have created (which could be used as the background for follow-on questions)? RPG SE has a just-for-fun tag and a showcase of user-designed character sheets as a community wiki