For the purposes of the exchange, worldbuilding is extrapolating (or interpolating) further fictional details from the fictional world the creator(s) present. If the way the creator(s) would have answered a particular "worldbuilding" prompt would have been to do RL research without bringing in any significant creative element, then it's not within the scope.
I would apply the same considerations to canons with considerably more fictional elements, too, on a case by case basis. (e.g. I would be unlikely to accept prompts for the Aubrey/Maturin series about the wider progress of the Napoleonic Wars, as that's a matter of historical record.)
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For the purposes of the exchange, worldbuilding is extrapolating (or interpolating) further fictional details from the fictional world the creator(s) present. If the way the creator(s) would have answered a particular "worldbuilding" prompt would have been to do RL research without bringing in any significant creative element, then it's not within the scope.
I would apply the same considerations to canons with considerably more fictional elements, too, on a case by case basis. (e.g. I would be unlikely to accept prompts for the Aubrey/Maturin series about the wider progress of the Napoleonic Wars, as that's a matter of historical record.)