Monk has a gap closer, too. It's called Thunderclap. No damage. But it puts you in range to attack and Monk attacks faster than a SAM does.
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I would argue that Six-sided Star is already the cleverest "range" attack among all melees. It covers two gcd and gives you a speed buff. This skill alone shows that devs understand the proper way for a melee to greed. You hit and run, deal with AOE within one GCD and hit your next GCD.
I doubt they would give MNK another completely superfluous range attack.