That's why we need samurai expansion - katana is superior choice in every situation! It can cut ork warboss in half in one slash!
Heh, maybe that will turn out to be true, but I guess orcs are not known for the quality of their armor-crafting. It would be funny if it turns out that, like in the real world, katanas suck vs. heavy metal armor, the kind that would NOT be found in Japan due to the lack of quality metal, as if swords were somehow made to be adapted to the threat profiles they would encounter, and the katana's typical prey is unarmored peasants and guys in lacquered leather armor, and trying to whack a guy in a metal can would just fuck up the sword.
Of course, swords in general don't perform their best vs. heavy metal armor, period, but the katana is a nearly pure slashing weapon that fares absolutely terribly against this.