whyfor the valorization of the UC ship over everything?

My thinking on this is that it comes down to different views on the purpose of fanfiction. There's the "more of this fictional world I like" view, which loves on canon 'ships especially, and the "things I want to see that the show/movie/whatever will never actually show," which focuses on the UC. I'm a bit of both minds, myself, so I can go for both. Which is to say that I don't know why some slashers seem to see it as slash *vs.* het...people are just odd.