You’re the one who said there was a geographic reason for it.

There’s no geographic reason for poles to be oriented vertically.

You’ve essentially just said “There’s a reason that we orient our maps so that North is up. It’s because that’s where the North Pole is and we orient our maps vertically based on the poles.”

Ok great, except that that doesn’t actually answer the question, because if you then ask “why do we orient our maps based on the poles” which is kind of implicit in the initial question, the answer is “No particularly good reason except that that’s how we do it.”

Edit: Sure, there are always reasons why an arbitrary choice went one way or the other. But you didn’t actually give the reason in this case. You’ve just asserted that there was one.