Why is gender, in particular, such an important part of identity to recognise?
What is the significance of tracking such information? What should be open/restricted for people who identify as female vs. identifying as male? Supposing that, as some TRAs seem to do, gender is something innate akin to a group of personality traits and skills, why do we need to officially recognise it? Why gender, and not astrological sign, or Myers-Briggs personality type, or whatever other nonscientific notion that some people nevertheless feel is an important part of their personal identity?
Gender doesn't have a rigorous definition, and it seems like two people can have the exact same characteristics except that one feels that they are the other gender, and the other does not, or rejects the idea of transition - and somehow that makes all the difference. I've also seen TRAs claim that you can't tell somebody else what their gender is - it has to be up to them to determine. So it seems like... gender doesn't mark out any sort of distinct category? In which case, why do people seem so desperate to preserve it as something that must be recognised?
I miss when I was first introduced to being trans on Tumblr years ago but the rhetoric was still 'sex is biological, gender is psychological', now it seems like TRAs are making the exact mistake of 'gender is the same as sex and needs to be treated the same way'...