Gender critical people want to map legal sex to chromosomes to legislate specific transgender rights out of existence, and yet, I have not heard a coherent definition of sex which divides all people into male and female.
Absolute bollox!
What "specific transgender rights" are gender critical people trying to "legislate out of existence"?
What about women's SEX-BASED rights, which are being eroded?
What isn't "coherent" about the definition of sex which is based on physical chromosomal differences?
Be any "gender" you want - gender is cultural and changes over time and geography. You can "change" gender by wearing different clothes etc (what used to be called "breaking gender stereotypes" ).
"SEX" however, is biologically determined and immutable. You cannot change your biological sex no matter what you wear, what surgery you have, or what drugs you take. You can change your external appearance to look more like the sex you would like to be, but no-one changes sex.
Sports, changing rooms etc are - or should be - segregated by SEX, nit gender.
The only reason these terms overlap in English is because some people are too prudish to say "sex", and others saw the opportunity this gave to blur a boundary.