As someone who trained Haidong Gumdo (Korean Kendo) for three years now. I agree. It is inferior to european swords!
And I am an anime fan but god -blam!-ing damnit do I hate people who praise a sword, which good aspects are the leight weight for it's lenght, without any knowledge!
Katanas were good enough to be used against japanese/korean armory. However in comparison to European armory and weapons it fails.
It is fun to learn the different styles however lol
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plus even the biggest broadswords were only 20 pounds max.