It was unfortunate that Cass left this window open. Given what she said, I was honestly surprised by the government response in blocking PBs. I felt they were reading between the lines to what she probably thought, rather than what she actually said.
There were many who pointed out at the time that the approach of trying to find a middle ground in a situation that was really quite clear cut (no benefits ever proven after several years of experimentation) was a risky strategy that might hand a weapon to those who want to continue to push these drugs on children. It was mooted at the time that she took this line to avoid accusations of extremism, but when you are dealing with extremists (as here) the middle ground is a dangerous place.
If this trial was conducted honestly with medics who had no agenda, it would probably demonstrate active harms with no real benefits, but those conducting it almost certainly want to prove benefits exist. That means the results will be skewed. I don’t think there is any way that this trial can ever be conducted ethically at this point. It could only have been done back when it wasn’t so embedded.
The most ethical experiment at the moment would be to take a step much further back. Clinicians don’t really know whether they are even able to select a group of children who would genuinely benefit (if such a group of children exists). It’s been noted that putting children on puberty blockers likely increases the chances of them transitioning. Clinicians would claim that the high rate of transitioning in this cohort means they selected the right group. So go back to supported watchful waiting, tell the clinicians to select a group they believe would go on to transition as adults, then see what percentage they get right. If they select a high percentage of those who do go on to transition as adults, then we would at least have proof there is an identifiable cohort of children who MIGHT benefit from transitioning early.
I suspect such a trial would clear these clinicians minds and a much smaller cohort, probably all male, would be selected. Even then, I have my doubts that they are capable of predicting which children will persist and transition and which will recover.
Until they can prove that they can properly identify a group of children with high efficiency, they should not be allowed to medically transition any children at all.