@GLaDTheresCake yes, ive been waging my own battle in the UK for the last 7 years to slowly push more endos to adopt it.
The argument against is unfortunately down to a historical failure in the european endocrinology community. There was a bureacratic error in a guideline that attributed the risks carried by synthetic progestins to bioidentical progesterone (while referencing studies that said the opposite) and every endo for over a decade took the position that synthetics were safe and bio carried risks of VTE/Heart/Cancer. So its a large act of negligence/incompetence that a lot of endos dont want to admit to not reading the studies.
The mistake has been corrected now but yeah, sadly its now entrenched and too many old men who dont take HRT themselves dont want to admit they were dangerously wrong and the ones in trans health have been arguing against transfem patients on this topic for so long its become a grudge.