What's wrong with the great journalism-to-PR migration?

Rosanna Fiske writes on a Poynter Institute blog that journalists sometimes move into public relations without knowing or accepting how the two differ. "Many PR professionals got their start in journalism, or were educated in J-schools. They know and respect the realities and challenges reporters face daily. Now, as more journalists migrate to public relations, I’m left wondering: Do reporters know and respect the realities and challenges of PR?"