@TheRealSumGuy You assume your grandfather didn't know how to make food, but perhaps things were very different than that.

The whole point of have wives and husbands do different things is that separation of responsibilities can make things easier.

Kitchens in particular can be very much like a workshop, the tools are in a specific place, the parts are in as much. Someone else comes in and starts working on things and everything gets all screwed up.