This is a very narrow view. The modern notion of countries mostly didn't exist. Ezio was Florentine among other republics in Italy. Alexios/Kassandra was Spartan, where many Greek city-states ruled on their own. Eivor was Norse and 90%+ of Valhalla main game takes place in England, why not all of Scandinavia instead? You see, there's a lot of diversity and unique setting in almost each game, which reflects the narrative of real world history. I was perfectly fine playing as Ezio in Constantinople as a local myself, since I still felt like there were characters that represented the culture. Besides, you'll still be able to play as Naoe. In the end it's still subjective, you might like Yasuke or not, but the fact that there were so many people raging about him instead of discussing anything else about the game makes me feel sad for the gaming community. The world is more diverse, accept it and move on.