This is the question that people should not be able to wriggle out of: they accept a much lower standard of care than they would for kids who are not trans. That actually is transphobic. That is treating children who have been put in specific groups worse than other children, by default.
This problem also applies to consent. There is no way that a child or young person can give informed consent to throwing away their natural sexual function (capacity to orgasm, for example), their natural fertility (capacity to produce own gametes) or reproductive capacity (for women to carry a pregnancy to term) and to take on unacceptable, irreversible side effects like increased cancer risks, loss of IQ, loss of bone density, vaginal atrophy, permanent voice changes, hair growth pattern changes. These are reported from blockers, taking long term cross-sex hormones, or having surgery.
Apparently human brains don’t mature fully until 25 years old and that’s WITH natural puberty.
What child or young person can truly understand what removing those natural capacities forever, or what rendering themselves a permanent medical patient, will really will mean to them as an adult?
How can they possibly consent to something they can never reverse and about which there is every likelihood they will change their mind?
Part of the reason there is no way to consent to this is that there is still a lack of robust evidence about either risks OR of benefits from medical, hormonal or surgical transition for kids. The research is not being robustly done even where children and young people are being prescribed these treatments in large numbers by the NHS, and have been for years. And that’s another national scandal in plain sight.
The lack of conditions to allow informed consent in irreversible medical, hormonal or surgical transition at a young age, are completely different BTW, to decisions that Gillick competent young people can understand in their own situation.
Examples I would give here are being prescribed contraception or an abortion if they have an unintended pregnancy. It’s typical TRA crap to say gender critical thinking is anti Gillick. Plenty of threads on here about that if people want to read more on that.