I have an idea about a novel that is necessarily hybrid -- not just going for dual appeal. One genre it consists of is dominant (2/3 to 3/4), which is the one I'm comfortable with, and the other is unfamiliar to myself. I'm wondering what people's thoughts are when they read these or attempt to write them. Is it necessary to have a strong familiarity with both? How are these books typically viewed? I won't say what the genres I'm thinking of are to encourage a diversity of opinion for a more robust thread.