Hunters and Titans melees don’t freeze their enemies immediately last I checked. Both of them gotta use at least 2 abilities to freeze an opponent. Do Warlocks have to use 2 abilities to freeze an opponent? No. They just need one melee attack (doesn’t even need a direct hit due to splash damage). So let me flip the question towards you now. Why would it be fair for a melee ability with instant freeze be able to freeze for the same duration as abilities that don’t instant freeze?