What about AquaMan?
To pull it off, they decided to go a for a shorter and trimmed beard than a natural long beard. The hair also is a bit shorter and trimmed than a natural long hair.
It's considered "long and wild" by modern standards.
In cuck terms, "it's better than nothing".
Although, the real reason they managed to pull it off is that they characterized AquaMan as anti-social and wild, spending time alone in the ocean as a lone wolf doing his AquaMan things.
So again, there is this negative connotation that natural (long) hair/beard = anti-social.
With Thor, it was "neglected". With AquaMan it was "anti-social".
Although they play on it as they are the heroes.
They use the card of "depression/neglect or anti-sociality is sexy because it shows their humanness".
They know Mr. Perfect is not trendy anymore so they tried to add "flaws" to the heroes.
And here "natural long hair/beard" is considered as a "lovable flaw".
Of course, it is also because they are good looking actors that they are allowed to do that.
All of that to say, they subtly enforce a negative stigma around natural masculinity (long hair/beard).
Natural masculinity should be considered as normal/the norm.