I feel like with certain weapons it would definitely make sense to have similar perks, such as maybe Arbalest also having barrier rounds, or Cerberus being able to work on Overload enemies. It might be a way to make certain weapons more viable for endgame activities like Nightfall: The Ordeal or GoS. If you have any other ideas, feel free to post them below.
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I'm sure new exotics that come out will have this, if the feature stays around.