I keep getting asked "why do you bring trans into everything" when trans is about toilets and dresses.
So I want to say, By losing the definition of woman, we lose the right to define women as a class ( or some prefer caste)
Why does this matter?
Feminists identified women's oppression as having a biological root. And it was understood that we have a common identity based on a common oppression. We knew that the decisions that governed our lives were made by people "not like us". One group/class of people decided that other people were not allowed to vote. Some people could work in government, get books published etc and others weren't allowed. Women understood that there were commonalities between those who could and those who couldn't. And through an understanding of our common oppression we were able to fight for our rights.
What we never envisaged was that those who governed us could simply remove the definition of woman so that it could be asserted that , yes, bad things happen to some people but nobody knows why, and nobody can define why it happens to those and not these. Abortion is no longer a woman's issue, because men can get pregnant too, and lots of men agree that abortion isn't important. Women won't need access to resources like family allowance because men get pregnant too, and men think the money is better spent on building bridges and highways.
We've lost our ability to declare that a woman has been wronged, and why she has been wronged, like in the case of the woman on the other thread who was ordered to have a state enforced abortion. I don't know if this was the right thing to do or not, but I know she is in the predicament she's in because she's a woman whereas we're told that no, there's no pattern, random things just happen to random people and nobody knows why.
I absolutely reserve the right to hold onto the language I need to name women's oppression, to keep the tools of analysis I need to understand precisely how and why women are being oppressed. And I reserve the right to acknowledge and identify women as a class. Before we lose all the rights our grandmothers fought for.
Trans is about a lot more than toilets.