Maybe they just wanna mess around with whatever weapons they feel like using. I mean, of course they could become a liability, but heroic strikes are meant to be a fun and casual escape from the intensity of raids and PvP. I understand your frustration, but please try to keep an open mind about this.
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Vanguard Strikes are the casual escape. You should be using proper gear in Heroics.
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36 strikes? Cmon people it has a burn on, it doesn't always, not hard to use the right burn and make it go faster.