yeah, I dunno. I've previously worked with a man with an extra X chromosome, also with a woman with a missing X chromosome. both seemed like outwardly fairly healthy people (him especially), if they were infertile or had similar problems (we weren't nearly close enough to discuss something so delicate) they'd of course have my sympathies.
neither of the above conditions is that rare, it's fairly likely that a middle aged person who's worked, studied, etc at a few places and/or met a lot of different people for whatever reason will have, knowingly or unknowingly, also met at least one example of the above at some point in their lifetime.
I think that the modern/modish use of 'intersex' usually refers to someone who has a DSD (quite often a less hardcore type than the ones I reference above) and who also 'identifies as trans or non-binary'?