These are some good points to consider for sure. I love Nioh and it just wouldn’t be the same game if it was made by an American studio.
For a filmic example of historical Japanese stuff altered by American perspective and ignorance we can point to The Last Samurai (a film that I am very critical of but also really enjoy). A lot of people criticize that film as being a part of the white savior trope (which is debatable because Cruise’s character saves no one) and rightly so, but in the actual history there was a man—who was French, not American—who took part in that rebellion and died during it. The movie spends way too much time on an American version of a historical actor who was essentially a footnote and invents this whole history for him so that we have to follow along with his pretty uninteresting struggle. Especially compared to the struggles of other characters in that same movie.
With something like Ghosts of Tsushima I’d worry about something similar happening. Like with The Last Samurai, they’ve picked a real historical setting and like with that movie a lack of perspective could easily ruin it. Perhaps they’ve hired Japanese historical and cultural consultants to help them in that regard. I hope so, but I’m not holding my breath.