It's all a conspiracy!!
No, I agree. Though the actors and actresses chosen do a superb job, imo, they were hardly Japanese.
Do we cast Antonio Banderas as an Irishman? I think not.
But I liked the movie anyway. Of course I am biased because I found the movie more than slightly erotic.
This is a work that we shouldn't discount simply for its obvious faults - namely the ethnic background of the actors. It is still a fine film with amazing cinematography. I'd see it again.