I mean this honestly - if you want more of a certain type of fic, then a good idea would be to write that kind of fic and build an audience.

When you say 'we can do better' it sounds a lot more like 'the fic writers are not writing things that match my tastes.' Fandom is participatory. There's nothing stopping you from building up your own niche, you don't have to wait for others to do it for you.