Those heavy blades are because the knife was made for more than just fighting... they are really survival knives where a strong heavy blade had advantages for things like chopping, batoning and prying. A knife optimized for nothing but fighting, like a dirk or a dagger will be much longer pound for pound than a survival knife.
Weight in a knife fight means nothing unless you are very physically weak... like child weak... BALANCE of that weight means everything.
In a knife fight reach is a critical advantage. the difference between 3, 4, or 5 inches is insignificant, but the difference between 8 inches and 12 or 18 inches is massive.
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