That "Origin" paper is pretty old, the core of it, I think I can still support, but it really needs to be rechurned.
Hugh, the simple answer to your question is that I do not know why most keris are asymmetrical. We can hypothesise, but perhaps that's the best we can do. I think its probably a "form follows function" thing, given the original form of the archaic keris, & the way it was used. But we really have no certainty.
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