You're just now figuring this out?
so can butter knives that are mass produced. I'm not lying, there are plenty of videos. And if you actually pay attention, the sword doesn't do anything in those demonstrations, it's all the bullet. Also, katanas can't even cut through the barrel of a gun, so put the glam, hype, and propaganda away.
The katana were weapons of last resort, the techniques used to create them were centuries behind what Europe was doing, and they were not created by ancient monk blacksmiths whose knowledge of swords were spaceage and beyond. Also, the blade is actually quite fat and quite top heavy.
Indeed. The katana reached it's pinnacle of design several hundred years before they stopped using it. At the same time, Japanese armor design did not stop improving. The result was a sword that was used long after it had gone obsolete. As for it's forging techniques? Those are techniques used to produce finer quality blades out of inferior steel. Similar techniques were used all across Europe, but as metallurgy improved, their use became unnecessary.
And while the katana ceased to evolve even while armor design continued to improve, that was not the case in Europe. Japan was an isolated country fighting amongst themselves, so they could afford to do that. Europe, however, was comprised of many nations and cultures, making it necessary to find an edge. So while armor designs improved (reaching a point surpassing anything the Japanese produced), sword design evolved to keep up.