Anyone who knows me, or has read my second book, or has stood too close to me at a bookstore knows I despise the concept of genre. I despise the tweed coat that genre wears when it decides what is literary and what is not. I despise the lab coat genre wears when it separates hard sci-fi from soft sci-fi. I despise genre's internalized misogyny as it reliably separates anything feminine into whatever category is least likely to garner acclaim.
There is one thing, though, that I find genre invaluable for: communicating a contract with the reader.