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!
[well, because it isn’t a melee that as an effect outside of point blank range, and other melees with a similar effect also don’t lose their charge when you miss. Just be glad shoulder charge (on all subclasses) has a longer cool down than the normal melee when we hit, allowing your teammates to get in close and shotgun us in the face like the apes most of us titans are.]