That's very interesting - especially that you devoured the fanfic first, then found the show not much like the fanfic.

That's Pros for you. I don't know what most of the authors are watching but it sure wasn't the same show as me. Sadly, I'm seeing the same in MFU. The boys are used as shorthand or avatars for whatever story the author wants to tell, rather than as themselves in their own world, doing what they do in the show.

I prefer them in their natural habitats,ie time, place, degree of campness, etc.
why write in a fandom who's canon you don't like? I don't get that.