My personal guess, not supported by any factual knowledge is that the working segment of the Aradam blade was left not serrated for practical purposes, to optimize its slashing ability. The rest was for show, to unnerve the opponent. Serrated blades are great for cutting but require a lot of to-and-fro movements. Their wounds leave a lot of tissue fragment without good blood supply and as such easily susceptible for necrosis and late infection. But that requires days, and at the battlefield you want to finish your opponent right then and there, with a single blow.
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