Look, just because the game originated by depicting cool and temperate climates does not mean that we can't depict warmer terrains like deserts and jungles. Fantasy art does not have to only show the landscape types found in northern Europe in order for gamers to identify with it!
And, you know... Moors only stuck to North Africa, anyway. And, Rome didn't ship people of all different types of skins all over at all, before that, either. Uh-uh. Nope. Not at all. Neither of these could possibly have had any effect anywhere in Europe for several hundred years, forgetting other points of contact on top of them. Nah. Never.