Keep the 3 slot primary, secondary, heavy but have the primary and secondary slot share the same weapon pool... Don't need to change anything else and this gives you way more freedom like energy primary with a fusion or chaparon with a kinetic primary...
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I could only see this happening is if Energy weapons did significantly less damage to unshielded enemies compared to Kinetic weapons.
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That will never happen. Original fatebringer is proof they hate the idea of people having all elemental equipment without some strings attached. As much as people complain about current sunset on d2 I laugh at them because of what happened with d1. The d2 sunset is incredibly tiny and weak compared to losing black hammer/fatebringer/gjallarhorn in d1y1 given those were actually very powerful weapons that were unique and significantly game changing.