Paid internships, stringer contracts, and entry-level jobs as a magazine factchecker or cub reporter at a newspaper provided training in the craft of reporting and writing, and clips from an established publication. Those lines on your résumé and clips in your file demonstrated a body of knowledge and a stamp of approval from an institution with credibility. It was akin to a journalism degree, except you were paid for learning on the job. A bunch of blog posts with little or no reporting or guidance from an editor doesn’t necessarily demonstrate to a prospective employer that you are a qualified practitioner of journalism. If you are an aspiring humorist or snark machine, that may not matter. But if you want to write reported features for a newspaper or magazine, it very well may.