I do think they are interchangeable truly yes. But in every relationship each person will have things they are better at than the other. And in life some people are just better at certain things. Sometimes that breaks down on gender lines but often it does not. Example I’m a horrible cook. My male partner is an excellent cook and enjoys doing all the cooking and baking. Are he and I equal when it comes to cooking nope not even close. But if I wanted to learn to cook I could. Who makes the choice? The woman or man that has the desire to do the job does. If a woman can be just as good or better at construction work then she should do it. If a man can be just as good as a nurse or nanny he should do that as well.