Blood & Honor was written by RPG designer, John Wick (no, not Keanu Reeves' character). The rulebook also includes an entry by GM, Matt Colville. You can find his GM advice on YouTube.

On the subject of roleplaying samurai, there are few dedicated rule systems. Most will adapt a popular system like D&D, others will turn to another originally written by John Wick, Legend of the Five Rings (L5R). L5R is actually an IP that grew out of a cardgame, much like Magic the Gathering. The setting of the cardgame is a cultural appropriation by white guys who've watched pulp Kung Fu, Ninja, and Samurai films. To me, this L5R is cringy, especially when trying to put aside the fantasy and pulp, one can't ignore the poor spellings and misused titles. Mr Wick was given this IP to make into an RPG, and shouldn't be blamed for it.

I guess to make amends for L5R, Mr Wick decided to make another Samurai RPG. Apparently he used his rule from his own House of Blood, I but I have not seen it to compare.

When I read these rules, they jumped out at being more accurate than other systems out there. Albeit, they still aren't perfect (see 掟 Rules for the Shōgun's Head for the changes I've made), but they make a good foundation to build upon.

I originally was going to use the rules as is, but I have a habit of making my own addendums the more I think on the rules, and B&H simply didn't reach the scope I was looking for, but it was the closest.

That said, there are inaccuracies. I'll excuse Mr Wick for being a game designer over a scholar of Japanese history. I am constantly studying anything I can get my hands on, and it's tough to paint an accurate portrayal of samurai life and court. I can only strive for perfection and accept that perfection is impossible to attain.