I'd say your post sums the situation up very well. In game terms then you really only need stats for the three categories rather then separate, individual blades. There are of course some exceptions to the rule though such as the plastic knife in the Special Forces book. Knives are useful in combat, but firearms of all types are used about a thousand times more often, even by PCs.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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