In spite of Finn being the poster boy for "If he could become super feminine and rich on Twitch, you can too!" he has won the genetic lottery that enables him to pass.
The majority of crossdressers and guys who want to do this don't have the looks to pull it off.
But it's all about that Brave New World "chase your real self no matter what" bullshit.
You may want to look like Finn but you'll end up like Keffals.