From what I’ve been seeing, it seems like E2 doesn’t really affect hair at 1-2mg, just causes sides and gyno. A dose of 4-6mg seems to be what provides results for hair. Bica seems to be the same way with its dosages. It appears that CPA is still somewhat effective at lower dosages though, but has pronounced sides (AnxiousAndy has results on it). spironolactone seems nearly useless, unless you are female then maybe it has somewhat of a synergistic effect with those particular sexual characteristics.
I wouldn't say spironolactone is completely useless, it has its place. I was taking 2mg estradiol, 200mg spironolactone and duta with no real hair benefits, my crown is still very thin. My hair is very important to me but i would like to keep it without being on a regimen that is too extreme tbh. On all those other meds my orgasms were pretty much non existant, still not recovered. If i can keep my hair and sexual health at the same time i would be happy. My hair is ultimately more important than orgasms though.