So even if we knew, with near certainty, that a child would be helped by gender-affirming care, you maintain "no exceptions". Because forcing 99 trans people through an undesired puberty is better for you than 1 cisgender person having a delayed puberty. Because 99 miserable trans people is worth saving 1 cis person from even mild discomfort.
You aren't a doctor, and more importantly, you aren't their doctor. Keep your nose out of other people's healthcare, it is none of your business.