Weapons can get damaged or they could be turning blunt over time, which is why Shastars have sharpeners for themselves. If you went to Nankana Sahib, you'd barely see any of the stuff that the Guru actually used, (kitchen, farming materials, and his famous Shastar stick that nobody can see), Sikhs have a history of over-modernization for some reason, (compare that to Christians who still cherish stuff related to their pre-Jesus prophets).
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