Huckleberry fits a different range and role.
That's like saying Two-Tailed Fox isn't worth the exotic slot because I can roll a Bad Omens with Tracking and Cluster Bomb when Two-Tailed Fox fills a different role than that Bad Omens.
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A role that breakneck will outperform it in. As far as pve goes giving up an exotic slot isn't a good idea for a weapon that's only good for ad clear. And being that close isn't really a good idea in endgame pve. For pvp smgs are borderline useless in the current meta. And without a buff their usage won't increase Also more people use bad omens over two tailed fox. Even though 2 tailed fox does its own thing. If it's own thing isnt sufficiently useful it won't get used