First of all, why do we marry?
Marriage is an institution that unites a male and female to jointly figure out the needs of each other and combinely face problems of life with courage and confidence.
For acheiving this goal, nothing is less important work or work of lesser importance.
For example ...there are genrally two portions on which one has to concentrate....the family needs and the outside family needs.

If one partner is taking responsibility of family care and other partner is taking care of outside family needs like outside job then its okay always.
But if both the partner start taking the same responsibilty then there comes a stage when one is overburdend and the other is less burdened. And I think thats not a justice at all.

Frankly coming to topic. If husband is doing job and is able to take care of families financial and social needs then the wife should take responsibilty of taking care of whole family itself. Being a housewife and taking care of family needs is not a small job and not an easy at all job. One should never underestimate it.

Similarly, if wife is ready to take outside family responsibilities then atleast husband should takle care of all family and housejob related responsibilities.