My initial thoughts: 1. Part of it is just where you are in fandom. Some places over represent in relationship fic and smut. If you're in one spot, it will look like way lots of that. If you're in another, you might see almost none. 2. Male to female composition may play a role in terms of stereotypical modes of telling a story based on gender. Over represented by women and you'll see more of the content you mention. Women tend to write more character driven fic which lends itself less to genfic in terms of how fandom does it. 3. Perception that the audience for this type of material is large, audience for the other is large. People write it because they want feedback or just to increase the size of their potential audience.
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1. Part of it is just where you are in fandom. Some places over represent in relationship fic and smut. If you're in one spot, it will look like way lots of that. If you're in another, you might see almost none.
2. Male to female composition may play a role in terms of stereotypical modes of telling a story based on gender. Over represented by women and you'll see more of the content you mention. Women tend to write more character driven fic which lends itself less to genfic in terms of how fandom does it.
3. Perception that the audience for this type of material is large, audience for the other is large. People write it because they want feedback or just to increase the size of their potential audience.