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Encapsulation is just another way of saying correctly used visibility modifiers. It doesn't mean the state has to be inseparable from the behavior, and its role is semantically fulfilled in Rust by modules. And IME issues with OO feeling like the better role tend to be people attempting to solve all the problems with one feature like OO lets you do, shying away from doing it with multiple features even though they're really multiple concerns. E.g. for common behavior manipulating common state among several local structs, a macro is what you'd use.