I have some limited experience working with antique Indian & mammoth ivory and while it's very strong, it's also somewhat brittle. When ivory breaks, the cracks can chip & spread like a split log. I assume a elephant tusk broken close to the root would be as painful as a broken tooth is to a human.
In the scenario where tusks are being used as a weapon, the illustrations that show them blunted with metal caps & bands makes the most sense for me, since it would protect the tip from damage & the bands stop splitting. Blades on the ends of caps, while intimidating, could be big levers that would risk breaking the tusk in use. I wouldn't want to ride on top of an frenzied elephant with a toothache & my hypothesis is the bands/caps are to protect the tusks while they're used as bludgeons, and the rarity of tusk swords implies they were tried but abandoned outside parades.
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