There's absolutely no proof that it raises estrogen enough in all men to compensate for the loss of male hormones. If you cannot understand that, a failing on your behalf not mine.
I took large amounts of beta sitosterol in my mid 20s which has been compared similarly to its hormonal impact as finasteride, and the sheer amount of hormone production and likely estrogen production from my base endocrine function at that age is what both kept my hair growing as well as keeping my skin looking good. It wasn't just lowering androgens, as I'm learning presently as instilling hair regrowth now is proving to be more stubborn than before.
As I've gotten older, closer to 40 I took finasteride and there was absolutely NOT the same response, and I know for a fact that I have been testosterone dominant for a few years because of the physiological changes that have occurred in my body, you know you can measure those and they correlate to hormones right?
If your body is not producing ENOUGH estrogen which cannot be guaranteed by merely taking finasteride, your skin will look like sh*t. I don't know how else to explain this to you if you don't understand what hormones actually do for the skin. It's either testosterone, or estrogen or a combo of both, but if one falters another must take up the burden otherwise you will be in an andropause like hormonal scenario where your skin and hair will BOTH suffer.
Some men naturally don't aromatise as much test or produce as much estrogen (you know visceral fat can do so as well right?) and two years ago I was deliberately taking things prior to my hairloss to help metabolize as much estrogen as possible because I was really into weight lifting and lowering my body fat % which worked I might add. That itself was me deliberately putting myself into a hormonally dominant state. To claim that cannot happen as a result of natural idiosyncratic function of somebody's endocrine system is frankly ignorant.
finasteride is no guarantor that your body will have any significant measure of estrogen, a relative percentage of it may increase but what relative percentage that actually is will absolutely vary not only from man to man, but at varying stages in life. I know this personally because I have dealt now with two patterned hair loss events, one of which I am just recovering from now.