Yes I'm aware Yes, questions can be Too Localized. But usually they are at far greater risk of being Too Broad exists, but I want to talk about something a little different.
Everything in this site is probably going to be "too broad" for a standard SE site. Most questions are "what if" questions that could be answered in myriad of ways. Even "localized" questions will likely have multiple valid answers, because Worldbuilding is not a direct science where there are yes or no answers. Anything is possible. So we may need to define "too broad" a little differently than most SE sites. My suggestion is something like
"A question needs to be answerable in a few paragraphs. A 'question' should only have one actually question inside it, and needs to have the context to be able to be answered in a specific way."
Basically I think we need to give people a little bit of a break when it comes too to broad. This site will easily produce multiple answers to a question, I think, because most questions will have multiple possibilities.
That aside, I think we should also consider discouraging downvoting of "too broad" questions, especially those of new users. Obviously people will vote how they want to vote, but I think we should have a sentiment of not downvoting these questions because it can be vary hard to grasp what is "too broad" on this site, because Worldbuilding is a very broad subject. I think it would be easy to get discouraged if your questions were constantly being closed and downvoted because you couldn't quite get how broad something could be.