Nathan Englander (What We Talk About When We Talk About Anne Frank) casts a little cold water on limiting your writing to what you’ve experienced personally:
I think the most famous piece of writing advice that there is is “write what you know,” and I think it’s—honestly, I think it’s the best piece of advice there is, but I think it’s the most misunderstood, most mis-taught, most misinterpreted piece of advice that there is. It’s so simple and so obvious. It used to terrify me, this idea of “write what you know.” I was dreaming, I was in suburbia, in my house, dreaming of being of a writer, and I thought, what am I going to do with “write what you know”? What I know from childhood is I was on the couch, watching TV. So I should simply rewrite a whole series of sitcoms for you. I should write a book called What’s Happening? and then I should write a book called Little House on the Prairie is on at 5 o’clock. . .