Finally I understand what you are tying to say.There is a reason South of Europe was more diverse, it’s all to do with Geography and access to other continents. There is no question to this, nor is there a lack of representation in media of Ancient Rome conquering and assimilating many other cultures for example. This is not the conversation.
The diversity expected by the article and proponents of skin color diversity everywhere, at all times as a standard is the issue. When Columbus brought back a handful of American Indians to Europe, that’s a worthy story - not that American Indians were documented in mid Century Europe therefore Europe must have been a melting pot of global ethnicity.
People rarely ventured outside their villages for their whole lives much less immigrated cross continent. Mobility was practically non existent and that shapes the regional ethnicity and creates period accurate cohesion.
Feudal Japan shouldn’t have white representation, century old African Tribes shouldn’t have Latino representation. It defies common sense to misrepresent cultural makeup when attempting to ground it in a time appropriate way. But logic be damned.
You are viewing this issue as Hollywood does, where they toss all of the races into one thing.
I said in my first post, most of this is a non issue in the rest of the world. USA society right now is obsessed with race.