Even if there is a 2:1 income ratio, each side can feel they are contributing monetarily and collectively decide what tasks are worth doing vs paying for.

I can understand the psychology of both sides - the breadwinner thinks they are doing their job outside the house so why is the spouse not doing all the stuff inside the house.

Any subset of tasks breadwinner spouse pick up (like dishes or laundry) they expects a gold star sticker for doing extra. Meanwhile the homemaker spouse feels put upon for the 1000 other things they do around the house and dealing with the kids.

Likewise this is akin to the homemaker spouse tutored the neighbors kid for $100/week and then telling the 6-figure breadwinner that they are also contributing to the families income. Each side feels correct and like they are going above and beyond their scope..