Ayelet Waldman is not the first to note that it doesn’t make sense to only write what you know. But she does put it particularly well here:

When writers only write what they know, we end up with lots of short stories and novels about young people falling in love for the first time, often in Iowa (the site of the nation’s preeminent writing program). All well and good, but at some point even the most beautifully crafted sentences begin to grow tiresome if they describe people we’ve read about a hundred times before…

Not that there is anything wrong with a book about young people falling in love at the Iowa Writer’s Workshop.