merlin holidays is about using some of your precious time to create something for someone just to make them happy. And yeah, you don't have to hit the exactly right spot with your writing, but that happens even to the best. You can't really get into your recipient's head, especially when you have just few lines of likes and dislikes to base your story on.

also, the way it works, the mods would never give you a prompt that would be completely out of your list of favourite stuff to write.

And why should be the minorities excluded? It's not like there's a rule that fics for merlin holidays have to be bright and happy all the way through.

When I started writing mpreg, I thought I'd be writing for a smaller group of readers and now when I look at number of hits at ao3, it's mpreg that has the highest.

Also, when I take your big bang story as an example, you had a very dark theme that was potentially very depressive, but you managed to brighten it up with love and hope. It's something not everyone can do.