It seems odd that each enemy faction has a decently fleshed out arsenal, yet, aside from some stylized exotics, we can't use any of them.
Imagine equipping the Vex torch hammer or Fallen shrapnel launcher as heavy weapons, using the wire rifle or shock pistols.
Seems like a real missed opportunity.just
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Because aliens resist each others arsenal. Have you tried using the pikes and tanks during s mission? They do piss all damage, imagine what their guns would do..