Why do I care? Personally, I care because I am a parent of an enby kid, and I don't have to explain to a lot of you what that means in terms of travel and governments. But even if I abstract away from that and look at it from a purely impersonal point of view, it makes *no sense* why any government body would keep records of that data. It's a bizarre vestige of the darker times when your status as a citizen was largely defined at the time of your birth (noble, peasant, male, female, Jewish, Protestant, etc).