@ Den12122 I'm sorry if I'm misunderstanding what you're trying to say, but most fanfictions that include OCs are different from the typical fanfiction where it's two characters from the original show being paired up. In those, it's standard for the content to be original. In the fanfics you speak about, following the show is the standard and expected, which includes dialogue and scenes from the show. The fiction aspect here is the original character and a storyline they have in addition to the show, which is original content.
I agree that there are plenty of writers who copy the show without that element and just give some lines to their character, but a lot of the fics that I have seen in your list have that original content.
But please, correct me if I'm misunderstanding your point. I would very much like to understand how you see it