Transgirls aren't biological boys when they start taking blockers. They also live and are socialised as girls
I mean this kindly because despite what has been said about me online, I really do only want the best for all the children in my unit, in our whole society.
Puberty blockers will impact hormone levels and affect the development of the brain and body going forward, but that's all. The boy or girls body stays as it is, suspended in time almost, as experienced by Jazz (please do correct me if I've misunderstood).
Socialisation starts from birth. Even before birth, with gender reveals and pink/blue shit. A child will have experienced socialisation of their birth sex, even if they transition very young.
This is why I'm so passionate about keeping GG open to all gender non conforming girls / trans boys. Of course it's their decision but we should be starting from a place of "this is your organisation, we are your friends, your supporters. You are welcome here for as long as you want. We will support you in any way we can, whether by staying with us or by us helping you explore other organisations if GG doesn't feel right any more".
These are still biological girls, who've experienced the same socialisation (even if only up to a point) as any other girl. GG is was a great place for girls to be free from stereotypes and gender expectations.