The combined use of more bladed weapons is well known and documented throughout history.
Just remember the famous Miyamoto Musashi who was famous for his fighting style using both the Katana in one hand and the Wakizashi in the other.
Also, there are many Chinese styles of fighting with two swords or two daggers.
Last but not least, just remember the European fighting styles with Rapier and Left Hand Dagger.
However, all these employ one single-bladed weapon in each hand.
Had the one-handed use of more bladed weapons (or a weapon with multiple blades) been of practical use, it would certainly have developed and became extensively used at some point in history. The fact that no such fighting style developed and evolved, demonstrates it has no practical use.
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