After 18 HRT is too late. Opposing that is dooming all trans girls who are not brave and ingenuitive enough to work around the system and order online, or live in a country where E is OTC.
Regardless if you believe more trans people are "coming out" because society is opposing trans people slightly less now (so less anti-trans propaganda) or from pro trans propaganda, it doesn't really matter either way, because gender dysphoria is an incurable condition and by denying care during the teen years, particularly before voice and height have developed along a masculine trajectory, you are effectively dooming those people. Though I disagree with your ideas about etiology, it does not matter; the etiology does not alter the treatment.