tl;dw: kojima says that asian people specifically the japanese (aka the japanese actresses he will even remotely consider for any role) have too much of a smooth and perfect skin with completely symmetrical faces which makes their textured models look dull and unlife like compared to the rest of the cast even when using the same technology.
the solution seems obvious but hey im not a visionary autor making cinematic games.
honestly the show hasn't aged well. the main lead is like 50 now. the season 9 was a trainwreck. just leave a story finished for god sake. this is what you get when copyright is over a century, endless reboots of old IPs until the sun explodes.