Raymond Carver on why he chose to focus on short stories & poetry
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Finally, a writer is judged by what he writes, and that's the way it should be. The circumstances surrounding the writing are something else, something extraliterary. Nobody ever asked me to be a writer. But it was tough to stay alive and pay bills and put food on the table and at the same time to think of myself as a writer and to learn to write. After years of working crap jobs and raising kids and trying to write, I realized I needed to write things I could finish and be done with in a hurry. There was no way I could undertake a novel, a two- or three-year stretch of work on a single project.'
Source: Paris Review