So I've been researching more into intersex conditions.
There's a youtuber who claims to have Androgen Insensitivity Syndrome (AIS). This means that, although they are chromosomally male, their natal development means they developed as female. Aside from non-visible symptoms (i.e undescended testicles in the abdomen), the only physical symptom of this condition is that they don't ovulate and can't get pregnant.
So what are they? ...A woman. Because that's functionally what they are. They were raised as a woman and clearly present as a woman. If they had been born earlier in history, they would be recognised as simply an infertile woman. Most people with AIS (it seems) identify as women and may not even know they have it. The fact they are "chromosomally male" is more of an interesting factoid than something that meaningfully defines them, unless they choose to. Which is what they have done, because they identify as "non-binary" and go by they-them.
What this exposes to me is how functionally useless the concept of being "non-binary" truly is. If even people who have intersex conditions, and could therefore superficially claim that it genuinely applies to them, don't actually benefit from the label in any meaningful way.