I don't want to make this thread about me, so I'll give one reply on this point and stop. To be clear, I'm not in favour of childhood transition. I totally understand your perspective @illinivich, and I doubt there is anything I can say that would convince you otherwise, but I truly believe that it's not the case that I am retconning. I don't doubt that some people do retcon, I'm just saying that I truly believe I am not doing. The truth is important to me, I'm trying to describe it accurately.
Before I came out my mother was staunchly GC. She might well have written the exact post you just wrote. That's how I'm aware of mumsnet, and why I'm supportive of much of what is discussed here. I remember her talking about the Forstater case, I remember her delight at JKRs first tweets. She was fully of the opinion that TWs were mostly or all just AGP men.
When I came out to her, as you might expect, her initial reaction was extremely negative. However, when I raised the conversation we had had back when I was 8 or so, her reaction changed. That was before I learned that trans people exist (that was aged 10 via TV, I remember clearly). Because the fact is she remembered that conversation from when I was 8, she remembered how odd it was, how awkward I was, how inexplicable what I was saying was. I was ultimately talking about wanting to be castrated. When I explained it was because of the gender dysphoria I've felt my whole life, she just knew that it was all true. At the time she said she'd felt very confused and ultimately dismissed the conversation as 'kids are weird', and given I didn't bring it up again, that was fine. But after revealing the GD it all clicked into place. That's what convinced her that GD in males really can be persistent from childhood, and she ultimately now agrees transition is a sensible option in my case.
Of course, perhaps she is just wanting to support me, wanting to retcon too or something? But we both remember that conversation, she even mentioned bits I'd forgotten. If nothing else, it's a sign there has been something mentally wrong with me since childhood.