I am just as curious. But one thing might be relevant risk related to cost/benefit analysis. Is this person testing? Has his face feminized? So there is both a safety issue and a feminization issue. We all know that increasing E2 has stereotypical facial and body effects and less so hair effects but yeah. Pretty much anyone okay with being "pretty" has a great shot at significant improvement hair-wise.
@bridgeburn continued to go by male pronouns but he had far more breast growth than normal and his face got more and more female. I highly doubt that he can pass as male now without losing those locks. I don't believe that HRT necessary turns a person female but anecdotally and not from me but from the boards, some claim increasing attraction to males as a side effect but this is probably just repressed feelings in my opinion. MtF on here indicates direction more so than identity, at least for me and my writings.
Anyone bald at first glance we take as male. It's an efficient system for making decisions about who might be dangerous in life and who isn't. White females instinctively, if not overtly, use height, beard growth and hair length to make snap decisions from a distance about gender. There are not trying to misgender anyone and it is silly when MtF's who are very tall or have stubble or short hair to get upset if they are misgendered. Put on a dress or skirt and I promise such folks that they won't be misgendered. A boob job helps here too. As I often say, there's a reason why HRT for baldness for guys hasn't been a thing until hormones became widely available because it has been deemed impossible to use HRT for hair purposes without feminization and this has pretty much always been known. So maybe this is another situation where people need to try Serms or await other meds.