I'm currently sitting on mostly lvl 7 survivors and taking my time leveling up. I only have the 3 beginning classes and was wondering if these will be used later on in the game. I ask because I don't want to continuously use my XP on leveling them up if they will become useless later on. Is it just a matter of preference later on in the game or do some just have no use in the future. this way here I know which classes, if any, I should retire before others.
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