I'm in favour of this.
I personally see no problem with 'real world' questions. Just because this site is about world building doesn't mean that everyone is building a completely fantasy or sci-fi world.
The way I see it practically no work of fiction is set in the real world, they are just set in a world that is almost identical to it. So as long as you are asking questions about the setting and not the story (which can be a tricky line to draw) then they should be on topic here.
I think the idea that we will get a flood of users coming here to ask how to change a light bulb or open a bank account is overly pessimistic. The kind of people who are likely to ask those questions are the ones who won't have read the rules or meta discussions anyway, so changing them won't encourage or discourage them.
Prior research is important, and I like the idea that there should maybe be a close reason based on that, as well as context. Explaining why you want / need to know something in the context of your wider setting can make it clearer that the question is on topic and relevant (and guide people to make more relevant answers).