I think what it says is that the basis of some gendered behaviour is biological. This is the "excuse" (as I see it) for having the pink and blue personality boxes.
But we also know that behaviour is plastic and the average differences between men and women are not great enough to justify rigid distinctions and divisions. Unlike with sex, in circumstances when it matters.
I think it's fair to say that even given all the choices, women do gravitate towards certain professions or jobs, men to others. Perhaps they always will. Women are on average more empathetic, men more aggressive. Men take more risks than women. Women take on the majority of childcare because child-bearing segues naturally into child-rearing. But none of that behaviour is inevitable. Fathers can be SAHDs and mothers can be the main breadwinner. Men can enjoy being carers and cleaners and women can dream of becoming astronauts. Fathers often learn to be more selfless and patient because of their children. Women gain self-esteem and confidence through participation in sport. Recognising what people usually do is perfectly compatible with not putting unjustified barriers in the way of people who want to do something different or who are naturally different. It's also very helpful to society to have both sexes involved in as many areas as possible to ensure that progress benefits us all, female and male.
Additionally, being a SAHM, or a teacher or nurse does not entail being meek or submissive or anything else. Girly girls play football and butch girls do dance or fashion. We can bring all our children up to be assertive, or kind, or ambitious, or confident or anything else. It may not take equally well in all individuals but that is because we all start off with different personalities.