The Titan melees constantly use the uncharged melee if an enemy is close, making use of thunderclap impossible at times especially with enemies that rush you. I play on controller so i'm not sure if its the same on mnk but i feel this is major issue with the kit.
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Yeah this happens even with using the charged melee only keybind, whether or not you hold down the button, it always uses uncharged melee instead if an enemy is in lunge range. It's even worse when you have the knockout aspect since it makes your lunge range really high.