Adept primaries have rendered using a particular special or heavy in pve useless. Just roll with a preferred adept of each elemental type so you've got every situation covered and you can use whatever you want in your special and heavy slots.
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I only use the adepts on nightfalls. They are pretty useless since burn damage has been nerfed to the point it is at now.
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Yes, but some people(me) don't have the time or people to get good, comfortable Adept primaries for each element. Also, you would lose ammo from switching between them.