I think women's ability to assemble and discuss their unique sex-based issues is important.
Trans women should be able to do the same.
But their struggles are not our struggles because we are not the same.
This is hypothetical. But say a women's group organised a meeting to discuss local women's issues. On the agenda is: problems caused to women by the maternity leave provision of a local business; the availability of menstrual products for girls in a local school, the proposed changes to an NHS labour ward and the opening of a new women's refuge.
How does any of that relate to the trans woman who has joined the group and wants to come along? Yes, they might be interested and have opinions, but then any man off the street might too. The fact is that none of those issues effect them. The women's meeting is not relevant and does not include them.
So do we change the name of the Women's Group? What to?
We can't call it the 'birthing person's group' or the 'menstruator's group' because that doesn't cover all of the issues up for discussion - nor some of the women in the group who are post-menopausal or infertile.
Do we have to add in extra agenda items to include trans women? So: the consequences of cross-sex hormones' or ' being misgendered in public places' just to include them? Then the women in the room would have nothing to contribute - in their own meeting.
It's maybe not a great example, but women's issues are not the same as trans issues. We are not the same. And we need to be able to talk about our problems in groups of people with the same problems - and we need to be able to give that a name! What name?
And don't say Cis women because I'll scream.
Words matter.