What you have isn't a difference of opinion; it's ignorance of the facts. In the year 1600, Black people, very often enslaved but not always, could be found in Japan, China, and India. They were in Russia and Poland later in the century but we weren't discussing them.

Everywhere the Europeans were in Japan at the time, there were Black people. In many of the settings where we've seen the Jesuit priests and ship crews, there would have been Black people. The 1980s version of Shogun is the definition of the white savior trope, an accusation that has followed the novel since 1975 and the original mini-series since 1980. I discussed how the 2024 version avoided it . Here's a review that discussed this. If you did any research you'd know the white savior trope wasn't a hallucination but a reality.

The decision to use Mariko and Toranaga as central characters alongside Blackthorne, who was the sole protagonist of both the book and the acclaimed 1980 TV adaptation, is an effective way to avoid the “white savior” tropes that the tale dances with. And it’s ultimately the thing that makes this Shōgun more than another elegantly staged historical drama, using three distinct perspectives to turn it into a rumination on life and death.

— Ross McIndoe, Slant Magazine

Before I wrote the story asking why there were no people in Shogun, I did research to see if it was a reasonable question. You should do some before proclaiming there were "no Black people in Japan" because you're quite wrong. The Spanish, Dutch, and Portuguese had them. The Jesuit priests engaged in the slave trade of Japanese and Korean slaves, which also isn't shown. Before calling someone else "retarded," try reading some history.