Loh's basic argument is that with the rise of so-called companionate marriage -- in which both partners try to work, co-parent, and contribute equally to household chores -- everyone ends up exhausted, delivering an at best mediocre performance on all of the above.

kind of goes along with the slogan "Jack of all Trades......master of none".

If one goes ahead and "specializes" in their job then they could be more efficient. However, more women work forcing this situation.