As far as I can tell the initial thoughts on Damascus is that it was done due to the lack of good steel, so mixing what was available was done. Pattern welded blades have been made for thousands of years, some celtic swords another classic katakana, these can also be classed as Damascus as once acid etched the layers of steel will be visible. Modern methods of producing Damascus hasn’t really changed but for the use of power hammers and presses. However with the availability of steels now different patterns are able to be mademuch easier, rather than creating a blade then using good steel to edge the weapon…