Because it can be made very sharp and very easily. It’s a trade-off. I bet I could make a sharper knife with obsidian than you could by sharpening a dull knife. It doesn’t last long, but for an arrowhead or a single opponent, it doesn’t have to. It just needs to get the job done. If you need something that last longer and you don’t have access to metal, you use stone, which isn’t nearly as good.
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