All damage dealers benefit from taunts, but probably he is one of the attackers that doesn't "need" it. He is fast (as fast as anyone at 70, currently) so he can shoot the especial shot before being targeted, and he has actually a decent HP pool for an attacker.
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Leai and fotp maybe able to output more in the right situation.
But its a pain to star fotp and leai as u need to swipe your credit card to realistically keep up with your progression.
GS has Good speed. Good special assist skill with short cool down.
His passive also gives him turn meter in critical