The god damn katana was made as a slashing weapon as opposed to the European swords. If anything, it's damage should be nerfed, since it's such a "skill heavy" weapon. As such, it should require tremendous amounts of skill to use in order to score kills with it. Yes, katanas were meant to be used on draw as a weapon right out of the sheath, but in that case, I think that if you get hit by a longsword, you should use 90% of your wpf due to broken arm.
Also, Japanese warfare was waged with polearms, not katanas.
So shut the fuck up with "buff katana" threads.
source: Japan here.