The void damage isn't what makes any subclass more useful than another. The voidwalker is nowhere near as useful as sunsinger. The gunslinger is useful in the current raid as a member of the teleporting party. On Venus he can super and shoot the pretorian to make life easier for the relic holder.
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So can a hunter with golden gun...and having the helm gives him 4 shots everytime he goes in the portal...hence I know so Im on the portal team in our Hard mode runs