'some roles which are for men and others for women and this means that they are some roles where men are superior and others where women are superior.'

How you come to this conclusion from reading these studies I don't know. These are based on AVERAGES......therefore some men will be superior at 'Women's Roles' and vica versa.
Therefore, trying to box people into traditional gender roles is plainly wrong and illogical. It actually strengthens the claim to do away with such traditional roles.