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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this is also an issue with Shiver Strike for Behemoth. Been a problem since Stasis was released too, so not a lot of hope bungo will actually bother fixing this. probably an issue with the core of how those charged melee's are built.