I agree. Pregnancy is (I think) the only legally significant biological difference (and of course some women don't/can't get pregnant, while some transmen do)

I think it's going to be a long time before socially acceptable gender roles become fluid enough to fully accommodate trans, intersex, genderqueer, gay etc people. But as it is, in a lot of cases they're not so much discriminated against by the law as ignored(*). Acknowledgement isn't the same as equality, but it's still an important step.

(*)Which in practice has a similar effect to active discrimination, though I guess in some cases it might be better to fly under the radar, the way that lesbians did for a long time