I'm coming here after all, Karsten
For me, every coexistence has its justification as long as it is distributed equally. I don't care who brings money home, who raises the children, or who works more or less. What matters to me is that there is balance in the partnership, and that neither one is exploited or wears themselves out while the other leans back.
If one is sick, the other must take over and vice versa. It's like your fisherman and his wife. Only not sick, but absent.
The shared life or partnership should fulfill both of them.
Other situations like raising children or caring for parents have to be managed somehow. Often, people accept disadvantages, often one gets stressed by too many tasks, and so on and so forth.
But everyone has the right to do it in the way that suits them best. You just make sacrifices for the family.
But there are limits. That's when the sacrifice affects only one person in a partnership, while the other celebrates life at the expense of their health or there is some exploitation of weaknesses.