Trans women are not "a boy who feels feminine", though. From talking to my trans friends, it cuts far far deeper than that - and indeed, is not the same as "boys who feel feminine", who in my experience present themselves in an entirely different way. There may be concern about one group being pushed towards the other (in both directions - this is what the calls to ban trans conversion therapy are about) but it is widely accepted they are not the same group.
Female vs open categories - I thought I was clear why not, but the answer is the near-impossibility of defining "female" for this purpose. "Female vs male" means those at the edges of the split get placed where it is seen to make most sense. "Female vs open" means some kind of specific gatekeeping about what defines a female, which will define many athletes (assigned/observed as female at birth, raised as female, always considered female) as "other" . Simply put, I do not believe - even with invasive tests and enforced hormones - we have an answer for that.
The lack of therapy full stop is a far bigger issue than any lack of exploratory therapy - as the Cass Interim Report makes very clear (see pages 51 and 69 in particular). Indeed it points to that lack of therapy as a
cause of the drive towards affirmative approaches:
From the point of entry to GIDS there appears to be predominantly an affirmative, non-exploratory approach, often driven by child and parent expectations and the extent of social transition that has developed due to the delay in service provision.
Finally, I think the "don't believe women when they support trans rights" stance is pretty problematic. Her competitors didn't just stay quiet and refuse to speak out - they openly and loudly expressed their support. See
https://www.newsweek.com/why-im-prou...pinion-1689192 for example.