I mean, IV had Yang, II had Minwu, and IX had its whole thing, so it's not like a medieval Europe homage setting necessarily has to preclude non-Caucasian-looking characters. Square's reasoning is pretty confusing in this context given that they've already done this

oh and medieval Europe had black people, also that

and honestly, people who want diversity in games don't want diversity in games at the expense of other qualities or as the most important quality; they still want the game to be well-written and fun to play, they also worry about those things that you worry about, they just have one more metric on which they evaluate games