Why bother putting a kill tracker in the masterwork? It's not like it's going to matter. Once a weapon is sunset, we'll never use it again until you recycle it anyway.
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#destiny2
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They're sunset 3 seasons after they're introduced. Sunsetting isn't removing them: you can still use them in quickplay pvp for example, as well as any activity with a power requirement equal to or less than that weapons power. The kill tracker is there because sunsetting doesn't remove them, it just removes them from the endgame meta.