I respectfully disagree with your disagreement. The point isn't that journalists need a more rigorous passage into a professional association or credentialling. Its more that journalism is a team effort, where writers, line editors, fact checkers, designers, data folks and others work together to produce an accurate and complete work.

You wouldn't take on a big case of national impact entirely solo and expect, and journalists can't produce a trustworthy product in isolation, not in the long run at least.