Going back to the DSD topic and "sex is a spectrum"...
I think, as I often do, the Genderists do have the core of something here but in their need to delegitimise a person's physical sex being a factor of any significance they fail to properly connect the dots and end up drawing a teapot when the actual picture was a helicopter.
Scientifically speaking, human sex is binary. We have DSDs where the blueprint misfired, almost always clearly a misfiring within one sex path or the other, perhaps within the 117 billion or so humans that have ever lived a handful that could be genuinely considered classifiable as neither, but we do not have permanent, structurally separate sex classes beyond the two.
But socially speaking, there is no reason we have to just recognise two types of human sex. Langauge, society and concepts are all human inventions. We did, and without implying any value judgement here, make them up. So we could imagine a society that decided certain DSDs made people a different type of human rather than a subset of their biological sex, just as we could decide that, oh I don't know, humans with red hair had a special name and social grouping, or in the past some societies considered certain mental illnesses to be divine and the people who had them had a specific social status.
So to that degree, I think the "sex is binary" and "sex is a spectrum" people are kind of talking past each other. One is speaking of the pure scientific fact, while the other is speaking of how we treat that scientific fact socially even if they don't realise that is what they are doing.
However society cannot create social structures that change scientific facts, at least not for very long, because if the social structure contradicts reality, reality will poke through and have to be dealt with. So stable social structures have to work within possibilties that are available from reality.
Which is why I think the "But DSDs" people are missing the point even though I also accept that social structures do not have to map 1 to 1 with scientific reality (crudely, that there is space for us to make things up) as long as they do not contradict reality.
Regardless of whether "But DSDs" is a valid argument to add recognition and provisions for new social sexes based around DSDs(1), or height, or hair colour or even trans identities if you want, still roughly 50% of humanity are simply female and deal with with physical and social consequences of that every day, and the existence of DSDs is not a reason to remove that social recognition of the female sex, nor that female people should not be recognised in law and language based on their sex, nor not be entitled to female-only supports where needed, nor be prevented from speaking about, researching and activism around female-specific challenges and experiences and naming them as such.
(1) Important to note this suggestion is offensive and hurtful to many people with DSDs. I bring it up here only to follow the logic behind the "But DSDs" thinking not as something I am proposing would be a good thing