Kabouter Games
Explorer
If you add a samurai class and a knight class, then the fighter class becomes less clear in what it is, and it becomes much more difficult to tell which of those three classes is the correct way to represent the non-magical warrior-type with the plate armor and the big sword.
I think this is less of a problem than you might think. You describe matters of flavor. Each is still a Fighter. They just look different and call their gear different things. The rulebooks even specifically address the Eastern flavor; a katana is a longsword, a wakizashi is a shortsword, a tanto is a dagger, mechanically. And ō-yoroi is mechanically plate armor.
If you're shouting commands at people, you're a Battlemaster, no matter if you call your armor dō or breastplate, kabuto or helmet, menpo or visor, kote or vambrace and couter, sune-ate or greaves, hai-date or cuisses...you get the picture.
Cheers,
Bob
www.r-p-davis.com