Because what an OP guns needs is an elemental primary. Riiiiiigggghhhht. Warlocks would be the only class to play in the raid then. You really need to understand what would happen to other guns is bungie die in this.
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Tlaloc isn't "OP" at all. Warlocks have to give up using their super at all just to activate it's special perk, AND if warlocks do end up using their super they are stuck with just a plain scout rifle with a cool design. Just because the gun kills in a short time doesn't mean it's overpowered what so ever.
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It's a good scout rifle that becomes godly when you hold onto your super. You get your super, on average, about 2 times every game. What people do is they hold onto their super all game with a godly scout rifle and then use it at the end of the game. In my opinion, the scout rifle is ridiculous. Especially for it being a warlock exclusive.
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How many times do you run into it? I've only seen 3 in the crucible since the release of TTK, and the gun makes you not use you're super and there are SO many ways to counter it. Sniper shot to the head, shotguns, supers, melee, and much more.