Players get to that intermediate level where they can already play pretty good, and that's kind of a dangerous period because they tend to start playing only the things that they can play, rather than the things they can't.
I read a lot of ghost stories because I was writing a ghost story. I didn't think at all I was writing a horror or a thriller or whatever because it is about a ghost, whereas a horror film can be about aliens or things that rise out of the marsh that have no human shape.