I believe you about the power of man to focus immense amounts of energy. Classical era Thracians would bring their Rhomphaia's down with great swings through Roman armor and flesh and bone and accounts say they would cleave them in half. They say the Roman's developed special helmets specifically to try and help counter it!
But there's a reason full plate heavy horse dominated battlefields for 200 some years during the pinnacle of their craft, even defending against gunfire for a long time (before massed gunfire and eventually rifled barrels made it impractical).
Regarding Damascus steel, yeah!
Little known fact: The steel did not come from the environs of Damascus, but the ores were said to be brought along the silk road from India. The craft with which the smiths made their famed weapons in Damascus seems to be lost but the key was some impurity in the ore which gave them their unique look -- and it's claimed a harder edge.
Harder than other steels or not, they were certainly more beautiful. You can tell by the wild patterns on the surface (though pattern welding can also produce this so just because it has that look, doesn't mean it's authentic).
This is a ridiculously lavish example, not to be representative of all weapons of this origin, because it's the saber of Sultan Murad V from the MET collection:
Close up of the tell tale pattern -- look closely at the steel blade itself (not the gilded decorations)
