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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Yup... however, [i]picking up[/i] enemy weapons would invalidate the Vendor System. Now IF they had Black Market Vendors (with a planetary appropriate RnG inventory) hidden about the planets in random locations... that would be cool. I [i]would[/i] buy a Shrapnel Launcher from a shady looking Guardian who's hiding in a far off unused corner of the map.