I do agree that the current wave of transitioners will probably be a medical scandal in the future. No-one seems to be able to provide any facts about it, beyond the idea that there is ( internet driven? ) contagion.
But; research? yes, we need it. But done by who? Done how? Over what period, and with what parameters? The argument that people have tried to do it, and have been rejected on grounds of " political correctness" sounds initially plausible ,and is believed implicitly by many, but it tends to look less convincing when one looks at the CV of those who have wanted to do it. They may not be unbiased, or may have an agenda.
That might even be said of James Barratt's "Transsexual and other disorders of Gender Identity "( 2007); after all, as a consultant psychiatrist and lead practitioner of the NHS's largest Gender Identity Clinic, some would say he has an agenda. It is his career. Though the book is edited by him, not written by him, so contains varied viewpoints.
As does "Trans Britain" Ed Christine Burns ( 2018) again, a number of different voices .But who is objective?
Calling for research? yes, good. It IS needed. Something worrying is happening. Assuming that research is being silenced , or is easy to do? Easy to say,not so easy to prove.