Why is it useful to pretend these people and sex configurations don’t exist and aren’t part of the full spectrum of humanity? Why does sex only ‘mean anything’ if it’s two sexes only?
You don’t have to talk about every single sex any time you’re discussing anything sex related, in probably most instances that’s not relevant. But it’s denial to act like they don’t exist or “count” because it makes thing’s more complicated. That’s intellectual cowardice.
Re your edit:
btw this is not the area of genetics and Y is a chromosome not a gene.
You think biological sex isn’t an area of genetics? Sibling, what??
Also, the SRY gene is not the Y chromosome: https://en.wikipedia.org/wiki/Sex-determining_region_Y_protein