I have recently made an observation: almost all the great writers that I can think of off the top of my head (Stephen King, Charles Dickens, Ernest Hemmingway, etc.) all take "write what you know" to an almost fundamentalist level. King wrote almost everything set in Maine, his home state, and a lot of his main characters are writers. Charles Dickens set almost everything he wrote (as far as my somewhat limited knowledge of him goes) set in France or London. He lived in these places I can't recall a Hemmingway novel that didn't involve WWI. Any thoughts on this?