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Myself, I think that all sciences are in scope on this site. (We're already barely getting any traffic; artificially restricting scope further probably won't help much with that.) The way I see it is: if it can be reasoned about using [the scientific method](https://en.wikipedia.org/wiki/Scientific_method), then it probably won't be off topic just because it's about the wrong scientific field. If we allow questions about [the biology of shapeshifters](https://scientific-speculation.codidact.com/posts/275771), then categorically excluding questions about, say, archaeology hardly makes sense.

It stands to reason that the harder sciences will to some degree likely be *easier* to extrapolate from and speculate about while providing concrete reasoning, but that's about the type of answers that can be given with reasonable effort, not subject scope per se. This may be more of a consideration in the *Rigorous Science* category, but even then, only insofar as *answers* are concerned. A *Rigorous Science* question can ask for something for which no answer can be provided given the requirements for answers in that category; in that case, the person asking the question won't get what they're after, but that doesn't make the question itself off topic even for that category.

That said, regarding the *specific* question that prompted you to ask *this* question, for me the issue with that one isn't so much the specific scientific field it's about, but that it appears to be asking about historical fact: which of two trade centers was more important for the ruling class at some unspecified point in time, given this potentially partial list of measurable criteria for "importance"? None of the criteria listed seem particularly speculative to me; difficult to find data on, perhaps, but not speculative. Personally, I fail to see any *speculative* element to that question, which may well have been why it was poorly received here.

Had there been, say, a *Chinese History* Codidact (which, of course, there isn't at this time), it probably would have fit right in there with only minor tweaks.