Some questions on clinical trials. Some hopefully helpful background.
First off, lots of treatments make it into standard care without trials. Some forms of radiotherapy are a good example of this. With new equipment, and new forms of radiation, the pace of innovation outstripped the pace of trials. The benefits of new machines were so self evident that they were adopted without much in the way of trial data as it would less ethical to slow down and do the trials than to just adopt the new treatments.
I can see how the use of blockers might have become established under this kind of adoption. The kids are distressed by their puberty ergo stopping puberty is a winner. No need for trials. This would have been enforced by pseudo medical bodies like WPATH.
This approach can work and be safe, as long as there is consistent and adequate patient follow up, which we know just hasn't happened for gender questioning kids.
Secondly, receiving treatment as part of a trial is very different to being treated as part of standard of care. It is a much more controlled setting. There will be a much more defined approach to patient selection. Consent is way more detailed. Patients have to be fully and meaningfully informed of all potential harms and demonstrate that they have understood.
Each patient will generate tens of thousands of data points, some protocols follow patients for many years. All this data has to be made open for others to interrogate and analyse.
This isn't just sunlight this is M&S sunlight squared. If a study is even possible there will be no where to hide.