I can't now find the post which mentioned additional facilities, so apologies for not @-ing that poster.
I'd happily get behind a campaign for additional facilities for those who believe that they have a gender identity different from their actual sex, so that they don't need to use the sex-segregated facility. I would fully support the addition of extra prisons, refuges/ crisis centres, hospital ward arrangements, showering facilities etc so that transgender people are not obliged to use same-sex facilities they are not comfortable in, and have no need to use the opposite sex facilities.
There are, however, a couple of issues with this. One is that for many transpeople, the entire point is making other people (especially women) validate their own view of their gender identity, and it's a common theme that many MTF will declare that they don't want their own facilities, they want the women's facilities.
The second issue is that there is virtually no recognition of the incredible effort and bravery of those who women campaigned for, fund-raised for, and have run things like women's aid centres and rape crisis organisations. There is a very vocal and litigious group of activists demanding their share of access to vulnerable women, whether that's sharing sleeping/ washing accommodation or providing counselling services to abused women. These facilities were not dropped from the sky by unicorns and stockpiled by women, they were set up by women to protect women. There's a vast amount of money bankrolling the TRA agenda, and that could be used to set up additional facilities which could be specialised to meet the needs of transmen and transwomen- but again, many prominent TW activists in particular rail against that, because breaking through the sex-based exemptions which protect women in more important to them than access to specialised facilities.