I haven't previously considered it. My first thoughts are that it developed from parrying weapons with a spiked knucklebow. I haven't looked to see if there are surviving spiked knucklebow weapons of sufficient age, but IIRC katars with one or two side blades are relatively old for katars.
Getting rid of side blades makes the katar easier to carry, and I think will make it easier to use in very close combat.
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