Is 64 classes still a good idea?

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How can you 'disagree' with something like 'more variations makes it more problematic to balance?

Your reasoning doesn't make any sense either. The idea is that because devs sometimes miss an interaction between items and build, balance becomes harder. The thing you said isn't wrong , it's just like... missing the point entirely.

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As long as no one acknowledges their existence it will be fine.

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It's the Pareto Distribution, right?