It doesn't matter if it's been that way for centuries. They're still social constructs, evolved to meet the needs of ages past. Gender roles don't serve any objective purpose anymore, probably haven't for the last two centuries - they only exist today because of social inertia.
Plus, for the vast majority of human history woman have been engaged in economicly productive work as well. The concept of the wife staying at home all day to do household chores instead of engaging in work that would feed the family is a rather recent development.
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