The pros
Still, I believe there are many reasons to take the plunge into another genre. We have a whole lot to learn from our brethren writing in other genres. We can rummage through their toolboxes for tools we can use in our own genre. For example, learning fiction craft will help the creative non-fiction writer with dialogue and structure, and the poet and screenwriter learn how to find that meat, that substance that gives the novel its heft and depth.