They think making shoulder charge take a melee charge would make it balanced.
Edit:since people don't know I'll tell you. Shoulder charge+ juggernaut =mayhem plus the perk that has a chance of giving a melee charge back after a kill + the exotic that gives a charge after death, and finally the Monte Carlo.
Edit 2:people typing "shoulder charge and juggernaut can't be used at the same time idiot", (or something like that) don't see the other part of my edit, the melee charge would be worked around with a new build, meaning the fix would be useless in balancing, and another Titan class would require an exotic in its build to have their "bread and butter" competitive like Defender.
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I don't think it should cost a charge, but it should either, A. Not be a 1-hit kill B. Make the user more vulnerable during charge.