Gender identity is frequently visible. I don't think many people are going to fraudulently represent their gender identity for a misguided chance at a job.
Well, I can imagine that people who aren't “proper” trans but are comfortable with, say, crossdressing start doing it in order to get benefits. Can't say I'm against that (more femboys IRL :^) and also this is on the queer-ish side so they probably still should get some preference if hiring process does take gender identity into account already.
