The only problem I have so far is with katana swordplay
Not to be rude but the more practical swordplay style in America would be fencing
and maybe even a rapier and dagger form
and the tai chi sword or the jian is more versatile than the katana anyway.
katanas just get better anime publicity for obvious reasons
it should be noted that Katanas where also used as a weapon in England for a while only because fire arms are illegal there. but none of them knew how to actually use a katana.