Used for questions on the ... genre itself, including its tropes and conventions.
However if you take a look at the tagged questions, they are both used very consistently on story identification questions as stand-ins for the genre in question. About 2/3 of total use across both tags coincides with story-identification, while only a small portion actually deal with meta-discussion of the genre as the wikis indicate.
This represents at least 165 tag instances which are very likely misapplied. What should we do about them? Purge them from story identification; change the wiki; ban them; something else?