Because - crutch.
End of list.
Let's see how many tired justification response posts you get.
English
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Ah yes, of course they are a crutch even though at base they have the slowest ttk by themselves.
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On a TTK level, Sunshot should be the best hand cannon in the game and Igneous should be one of the worst. It's more complex than you're making it.
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........and there's the first.