There's evidence (the Cass review) and then there's WPATH.
This article by Hannah Barnes gives a good summary of the problems of relying on WPATH for guidance.
https://www.theguardian.com/commentisfree/2024/mar/09/disturbing-leaks-from-us-gender-group-wpath-ring-alarm-bells-in-nhs
Despite its grand title, WPATH is neither solely a professional body – a significant proportion of its membership are activists – nor does it represent the “world” view on how to care for this group of people. There is no global agreement on best practice. The leaked messages (and the odd recording) – dubbed the WPATH files – are disturbing. In one video, doctors acknowledge that patients are sometimes too young to fully understand the consequences of puberty blockers and hormones for their fertility. “It’s always a good theory that you talk about fertility preservation with a 14-year-old, but I know I’m talking to a blank wall,” one Canadian endocrinologist says.
WPATH’s president, Dr Marci Bowers, comments on the impact of early blocking of puberty on sexual function in adulthood. “To date,” she writes, “I’m unaware of an individual claiming ability to orgasm when they were blocked at Tanner 2.” Tanner stage 2 is the beginning of puberty. It can be as young as nine in girls.
...Surgeons talk about procedures that result in bodies that don’t exist in nature: those with both sets of genitals – the “phallus-preserving vaginoplasty”; double mastectomies that don’t have nipples; “nullification” surgery, where there are no genitals at all, just smooth skin. And doctors discuss the possibility that 16-year-old patients have liver cancer as the result of taking hormones. The problem is not necessarily the discussions themselves, but that the organisation is not so open when speaking publicly.
...The most recent version [of WPATH’s standards of care] does away with all age limits from the beginning of puberty for hormones and surgical interventions, other than female to male genital surgery, and contains a chapter on eunuchs.
Several staff at England’s NHS adult gender clinics are not just members of WPATH (one is the former president), but authors of that current SOC. So too was Susie Green, the former boss of the young people’s charity Mermaids; a lack of medical expertise does not exclude either membership of WPATH or the power to influence policy.
This is important:
a lack of medical expertise does not exclude either membership of WPATH or the power to influence policy.
Do you really think WPATH’s "evidence" should be given equal weight to the Cass review?