As for metals, what is the quality of that said metal? also Cost and avaiblity of said metals to use in armor is another set of questions. Also even if the cost wasn't an issue and avaiblity of it, don't forget that the said armor is going on a person, Even an well conditioned person can subcome to fatigue with armor as well.
I don't see how an appeal to cost makes sense. Unless you are assuming the knife wielder isn't equipped with armor of the same tier as the enemy he is attempting to fight. Which begs the question of whether the knife wielder will survive to get into knife range in the first place. Incidentally, this is an answer to the above question about current bulletproof vests not necessarily resisting stabs.
Knife "damage" isn't going to scale with technology nearly as well as the combat hardsuit's ability to resist damage. The knife is contingent on human strength to cause damage, unlike the suit, unlike small arms.
The only way around this is to claim enhanced strength from whatever tech, but that isn't free and runs counter to the economic argument presented for the knife.





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