All the visible bugs in the trailers aside, they used a lot of non- Japanese things to make their game set in Japan, which upset many including Japanese viewers, especially when they claimed the game was a historically accurate depiction of feudal Japan (they have since backpedaled from this and course corrected to a “fictional depiction of history”).

The architecture they featured was Chinese, not Japanese. Yes they are similar, but Japanese viewers were very fast to call this out. They also talked about how the season was inconsistent with the cherry blossoms blooming, as in Japan seasons are very culturally and agriculturally important. The special trailer designed “only for Japanese audience” had subtitles in Chinese. Ubisoft stole a historic reenactment groups logo (they later acknowledged this and apologized but IDK if they actually removed it from the game since it is still on physical promotional goods), they are reselling a replica of a character’s sword from the anime Bleach as if it was a sword from their game. Characters in the game bowing to Yasuke would never have happened historically, as he was a foreigner, but more importantly at that time Japanese towns would have killed a person wearing war armor because some at that time were raiding those towns wearing war armor.

This game has a plethora of other problems I won’t mention. Point is, there are a lot of problems. Problems that could easily have been solved had they asked for input from real Japanese historians or even just Japanese laypeople which they clearly refused to do.