Some policies benefit more people than others. Everything is a trade-off. If you benefit a minority, this might backfire for a majority when the policy is exploited.
I think that there is no need for legal recognition of gender as opposed to sex. What difference does it make? What difference does it really make if a transgender can't legally use the bathroom of their gender, and such things, or can't have a different letter on their passport? Why not just accept your sex and still be trans? I'm sure people do it. I think it's unlikely that the risk of a transwoman in a men's bathroom is that high that it's better they use a women's bathroom.
Regarding public events for women or men or whatever, I don't really care what private companies do or organisations, since they have a profit incentive and free association to keep them in line with what people want.
It only really matters to the government because people don't have free association with the government, but the government isn't even stopping you from doing what you want in your life, so it doesn't really matter. Why freak out over a few sex-based things when you can literally live your entire life outside of that however you want?
Nothing about sex-based stuff really stops you from being trans.
If people can just self-ID into being trans as though they were literally the opposite sex, then people can easily take the piss, troll and frustate the vast majority of people.
I wrote the below, and then I thought about it some more and wrote the above:
Pretty much, a young woman on Discord (from Brazil) said there's two types of trans women. There's the "American" type, which is manly, and there's the Brazilian type which actually acts like a woman.
When would the Awesome Party allow legal gender change? It's simple. Does the transwoman blend in around women? No? Does she stick out like a sore thumb? Then she's not a woman.
Public female single-sex spaces will not be available to a trans woman unless she is castrated and blends in with women, and public male spaces will not be available to transmen unless they blend in with men.
Privately, people will make whatever spaces they want (though they may be regulated on a case-by-case basis by decision-making by the two councils). This is default policy and guidance regarding your public facilities, meaning they're state-run.
Remember that Party policy may, of course, change, at least from one manifesto to the next (if we even need them), based on the ideas from the council of awesome dudes going through the council of mothers, producing singular compromise policy from the people in society who most need a say.
"Gender/sex change/questioning" drugs/services are not essential and will not be available on the NHS, and will not be available privately either for those under 16.