This has got to stop. Every time flaws in the setting are pointed out, defenders hop from one foot to the other, going from "Rokugan is not Japan! It's heavily Western!" to "Rokugan is a heavily Asian fantasy, you can't judge it by the standards of Western fantasy!" and back. It's tedious and unproductive.
Why must it stop?
It's true.
Rokugan is not Japan. Rokugan is not Lord of the Rings with katanas. It's Rokugan, an East-Asia flavored magical fantasy setting with plenty of its own headaches arising from its erratic twenty-year history.