Europe had far better materials and forging methods. Double-sided swords were common. There’s a reason Japan’s best swords were single sided. Katanas require

Europe had far better materials and forging methods. Double-sided swords were common. There’s a reason Japan’s best swords were single sided. Katanas require so much work just to get usable steel. The reason for the way they hardened one side and softened the other was so low quality steel wouldn’t break.