Genre is important. Readers have expectations for their genre, and genres have certain conventions. While authors will play with conventions and tropes on occasion, there are still certain things that they will hold to. Fantasy needs an element of the fantastic. Be it high fantasy, urban fantasy or any other form of fantasy. Science fiction needs to take an element of science, or at least something that sounds like science. Historical fiction must take place at some point in the past and be accurate to that time.
The problem of genre is when the writer isn’t completely certain what kind story that they’re even writing. Then you get some of the more annoying elements of the Twilight Saga:
It’s Not a Romance (But It’s Trying to Be)
