There is a lot here.
DSDs it sounds like you don’t know enough. All DSDs are either male or female which means they have reproductive organs that were geared toward making eggs OR sperm but not both. There is no third gamete or spectrum of gametes. Something goes wrong in the development (exactly what goes wrong is well understood by biologists) so that external genitalia might not look normal, or be easily identifiable as male or female. In the same way that other parts of the body can develop wrongly in the womb. They are a fraction of 1% of the population. Some people are born with extra fingers, but we don’t suggest that the number of fingers on a human is on a spectrum.
A spectrum implies continuous variation from one end to the other. There are only two sexes, and a tiny tiny number of people where there is a problem located on the sex chromosomes.
It is not necessary for a woman to have a womb or give birth to be female. Of course not. Female means XX chromosomes (except in rare DSDs) and a body designed to make eggs (rather than sperm). Even if that body doesn’t make any eggs or has no womb because of a medical problem. It doesn’t make that person male. They don’t have testicles, they have ovaries, or partly developed ovaries if something went wrong. A male person is designed to make sperm, even if there is a problem and they are infertile.
But the important thing is that even if not all women bear children, or are able to bear children, or choose to bear children, ONLY women bear children. And so in society we are treated differently at work (don’t hire her she might go off and have a baby; let’s make her redundant as she’s part time now she has kids, so she’s not as valuable to the company; let’s pay her less, she’s not as committed because she has to leave at 5pm to pick up the kids from school), and are vulnerable to male violence because we are smaller and weaker. It’s just fact, it doesn’t mean we are less clever or less human.
We can’t identify out of this, even if we “present masculine” or work in engineering. It is to do with our sex, not anything to do with gender presentation.
A man who presents as “female” might take hormones, have plastic surgery and wear a skirt and lipstick, but it does not change his sex. He is still on average bigger and stronger than most women. This is his gender presentation. I don’t care if that’s what he wants to do, other men should be more accepting of gender non-conformity.
But I do not think that toilets, changing rooms, women’s groups, rape crisis, prisons, sports should be organised by whether a person is wearing a skirt and make up or not.
These spaces were separated by sex for a reason; humans have understood for ever that women are vulnerable to male assault, vulnerable to rape and impregnation, we can be physically hurt by almost any man who chooses to do so. It is just that most men don’t choose to do this, but we do not know which men are a problem, so
in public life, places where women are vulnerable or need privacy have been historically separated by sex.
Transwomen are still male, they mostly do not pass as female, and do not have female patterns of criminal behaviour.
Gender presentation is not the same sex.