I main a warlock if I completely miss with my ranged melee I lose the charge. it's the same with the hunter throwing knife. And the Titan melee is way stronger and is available in every subclass!
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Because it is ranged. It leaves your body. Same with smoke bombs or throwing knives as well. Titan SC is used primarily for mobility, and secondarily as a knee-jerk reaction. Taking that away every time a Titan used his charge would kill off any SC Titan tree forever