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A three-class system is, in my opinion, more interesting.
However, there are a couple of nuances that I don't quite understand (it's more of a matter of personal preference).
1. Druids don't really fit with machines for me. They seem to be more connected to nature/animals and ignore/reject technology.
2. A "rusher-mage killer" isn't really an Amazon in fantasy terms; it's more like a Witcher or a Witch Hunter.