Absolutely agree. Both men and women are "life givers."  These days, women can attach many other labels to their names - accountant, soldier, doctor,  teacher, CEO, president of a company or a nation.  It is time for men to adopt more of the nurturing of children through their early years to free up the women to assume the responsibilities for which they are capable.  

Other than in the question of which has the egg and which has the sperm, how much are roles assigned because of cultural?  And why? - because most men have bigger muscles than most women?  How much because a woman carries a child in her womb and birthes fully formed life out of her body?  

And are we evolving beyond the size of muscles as a determinant of holding power and into the size of brain being as or more important?  Scary to think about, but science is even on the brink of making cells become egg or sperm and developing artificial wombs.  What will "gender" mean then?

We aren't in the scary future ...  yet.