To address the overall topic, the idea was basically a reason to have Sentinels characters acting out non-Sentinels stories, and it was a pretty creative framing on the whole.
The “European Fairy Tales” part was for copyright reasons, which is not particularly surprising as C&A are as bound to that as their fictional metaverse is. I can’t fault them for that part.
I agree that the reveal of him as a frustrated writer was a little underwhelming, but that doesn’t make the overall idea any less fun for me.
The irony is the recent things you list are also popular. The werewolves and Soul Twins have been crazy popular in this RL fandom.