This is the thing you're not understand. If a woman has a very sick husband she is forced to take on his job and do all of the above YOU mentioned yet she will still be the one nursing him.Man is already looking after other women in his family and/or his children.
Man is out working all day to provide and has no time to look after his wife except maybe a few hours
Man is out travelling for work to provide for family
Man has other responsibilities he has that he had before wife was ill and now he cannot change those responsibilities
Ask yourself. Are women stronger than men? Less tired then men? Why is it that a woman can be a breadwinner yet she still has to and can take care of her family yet a man can't?