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The benefit is PvE diversity in the primary category.
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There is diversity, you're not gonna use a void primary for example on mobs with solar shields. As it stands now I'm pretty most players have one kinetic primary they use for most things. What's the difference?
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There's not.
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Oh sorry, you are one of those who would prefer to use a Fatebringer till the end of time
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If it is the best choice for the encounter yes, if it is not no.