I think it is a logical decision seen in the context of the current interpretation of human rights laws.
Our human rights laws largely come from the European Convention on Human Rights, which was signed in 1953 and quite obviously doesn't say anything about trans rights.
The "human right" to change your legal gender has been retrospectively interpreted into the ECHR, which, quite frankly, is an absolute clusterfuck from a democratic point of view. On the one hand, it is necessary to read between the lines of the ECHR to a certain extent if you want to argue that it is a human right to marry your same sex partner. Otherwise you have to reconvene all the signatory countries to the ECHR and get them to agree to amend it. It's much easier to argue that something which was never contemplated in the original treaty was there in the spirit of it all along. On the other hand, this approach lacks democratic legitimacy because you are trying to force countries to comply with obligations they never actually signed up to.
The legal basis for arguing that people have a human right to change their legal gender comes from the Article 8 rights to a private and family life. If the established position is now that people have a human right to change their legal gender, people who have done this must have all the same human rights as people who have not changed their legal gender. This includes the right to have a family.
If you consider that changing your gender is a human right, it makes sense that such a right should not be conditional on having any particular medical interventions or agreeing not to have children. No other human rights are conditioned in this way.
But the direction of travel with all of these decisions is essentially that:
- Changing your gender is a human right.
- People who wish to change their gender cannot be required to do or not do anything which would prevent them from exercising their other human rights.
- Essentially, trans people should be able to do whatever the hell they like and to even question their logic is inherently transphobic.
At some point I think it has to get to the point where everyone sees how ridiculous it is. And then the pendulum needs to swing back to, "people have the right to change their gender but only in situations where it doesn't infringe anyone else's rights".
And that's when a gender recognition certificate truly becomes a worthless piece of paper.