I realise that in the context of the current gender-binary-based legal systems of the world, many trans people have to fight to be recognised - as either a binary gender, as as non-binary. And many struggles have been fought over it.
So like. Someone who got their F on their passport might not like simply removing all markers entirely. I have an F on my passport, and it bothers the hell out of me.
But mentally I'm sometimes F! So X would be wrong. M felt more wrong; I usually feel more like X.