Perhaps there are few longhaired yet balding male celebs is because they KNOW that their hair is thinning so they don't grow it out long. Woody Harrelson started going bald in the mid 1980s and never grew his hair out long because he knew it would look ridiculous.
My husband is bald on top and grew his hair out during lockdown and it looks ridiculous. It is at his shoulders now and thick and curly. Nothing on top. Yep, I think you don't see males with a bald patch and long hair out in public because it doesn't go down well. His friends ridicule him endlessly.