As I understand it, it wasn't set up to facilitate that at all. It was a specialist clinic set up in the late 1980s for a tiny number of children and teenagers in England and Wales (about two thirds boys, one third girls) who were experiencing extreme distress related to their gender, i.e. feeling that somehow in spite of having a perfectly healthy male or female boy there was something about their personality that made them feel they couldn't actually be male or female. They felt more like the opposite sex. This makes no sense at all unless you think that there is only one valid way to be a boy/man or a girl/woman, which is obviously nonsense, given how different gender stereotypes are from one society to another and from one historical period to another.
At the time the standard treatment for gender dysphoria in children was watchful waiting. The child and parents/guardians would have many appointments. A detailed medical and developmental history would be taken. The psychiatrists and other clinicians would diagnose any other conditions that might be affecting the child, e.g. depression, anxiety, eating disorder. They would look for signs of neurodevelopmental disorders, e.g. autism, ADHD. They would ask about things that might have affected the child, e.g. medical problems, family break up, bereavement, witnessing domestic violence, experiencing abuse or bullying. There would be a lot of talking. It was important to talk to the adults as well as the children to try to get it across to them that if their little boy was a sensitive, quiet child who liked dressing up and playing with dolls that didn't mean he wasn't a real boy. How were they responding to his developing personality?
The rationale behind watchful waiting was that research showed that virtually all children and teenagers feeling like this became reconciled to their sex once they were through puberty. Only a tiny minority went to the adult gender clinics to ask for medical intervention to make their bodies look more like the opposite sex.
Unfortunately, however, a Dutch gender clinic decided to try a new approach, prescribing puberty blockers and then if the child and parents wanted it to put the child on cross-sex hormones. This was supposed to happen only in a tiny number of cases after exhaustive assessment. It didn't. The US medical industry spotted a huge moneymaking opportunity and very soon the standard treatment across all wealthy countries (oddly, gender dysphoria is not a big thing in poor countries, go figure) was to rush kids onto puberty blockers more or less on request.
Look at the numbers of children seen at GIDS many years ago. Look how fast they were going up and how quickly the balance swung from mostly boys to mostly girls. The clinicians who just accepted this without wanting to know why have failed in their responsibility. They really ought to be held to acccount.