Rock paper scissor specialist
Acidic doesn't need to launch you. He keeps you at his 50/50 range and blast you with the tick acid. As you said, alien has excellent range and acidic just keeps you at that range better than tarkatan.If I lose to an Alien it's not because "damn that zoning, it's so hard to get in" it's because of his dominating footsies and offense, which Tarkatan does better. Being able to get off the ground far easier, pressure better, and launch safer is WAAAAAY better than nickel and diming it with small mixups in Acidic to be safe, or "zone" in MKX.