(image from Wikipedia, rotated to not be super tall)
did you know that in the medieval era most spears used to hunt boars had to have a little crossguard down below the speartip? that was because if you hunted a boar and stabbed it, it would probably just keep on moving and gore you with its tusks. this would be a bad outcome for you, the hunter.
so a bunch of different cultures realized they could stop this from happening if you kept the pointy-bit of the spear far away from you, and thus after you stuck the boar you could keep it at arm's length. no boar tusks! no goring of the hunter!
it was a really useful design and also now I can never not think about it when I see a fantasy universe where everyone kills everything with the same type of bog-standard sword. if you lived in a world with weird monsters everywhere you'd probably develop unique weaponry to fight them! because you'd need it!
