I professional know trans men who are housed in women's prisons and trans women who are housed in men's prison, and it works as well as the prison system can work at this time. Nearly all of them are entirely understanding on that and don't see moving facilities to be of benefit.
Are there things that could be improved? Absolutely, but it's not and hasn't been popular to discuss how to improve things for prisoners in a while.
Also btw- there is not really a "community" of people with sex variations in the same where as there is with trans people- there isn't the same kind of social organisation and advocacy within this group.- to the extent that there is - it is under the banner of "intersex", so statements such as "they don't like being called this, they want to be called that" are completely inappropriate and false (although gender criticals love to trot out this line in service of their own agenda). Some people feel that way, others very much do not:
I agree with the latter point that different people have different opinions on what to be called; however, I strongly disagree that there isn't a strong community of people with DSDs. It isn't the same kind of advocacy and social organization as for trans people as they are advocating for very different things and organise differently around different needs, but they have decades old and strong social organisations and advocacy groups which have brought about changes in law in many places and I've found great to work with.
I'll also point out that there are a lot of terms where it's okay for those part of a group can use it, but it isn't for those outside of it. I wouldn't put intersex firmly into that category, but I understand why some avoid it and it's not for gender agenda reasons.
it won't change the fact that trans people exist, they are valid, they need to be accommodated in society, sex development isn't simple, and segregation isn't the answer.
It's already acknowledged within the prison and wider criminal justice system that trans people - and other gender diverse people - exist and there are accommodations for them.
Sex development not being biologically simple doesn't mean segregation doesn't have benefits, just like segregation of prisoners of the same sex from each other from each other - we have separate facilities for sex offenders, for example, because it helps everyone in the system.
Age development is also not biologically simple (very few things are when we dig into them), potentially less simple than sex development from a neurobiological point of view. Age, unlike sex or gender, is a mitigating factor for sentencing so it is taken very seriously. We separate prisoners by age as well as sex. We have male prisoners many years from being a minor who will adamantly argue and possibly actually feel they are teenagers or even younger. I could see the argument that possibly neurologically that might not have developed to an adult level, even when not agreeing with the mental age argument, but that segregation, the clear cut off, helps everyone in the system. It keeps people safe.
As for being valid - trans people are one of many types of gender diverse people. Their care is already acknowledged and supported as well as anything is in the prison system. As I said, nearly all the trans people I meet housed by their sex in prison entirely understand both the practicalities and the justice in the situation - the idea that it's so invalidating for all trans people is a bit like saying everyone with a DSD hates the term intersex.
Really, for Tandora or anyone else who thinks sex is too complicated and sex segregation isn't the answer - what's your experience of the prison system and how would you divide prisoners, if at all? If you divide by gender, how will it be less complicated and safer than dividing by sex for more prisoners and more prison staff?