I don't care what those "experts" think. "Authors, Editors and Printers" makes "editors and printers" a single entity, like ham and eggs. It looks stupid, it reads worse. I think someone just got tired of having to make a little comma. If they recommend to use it to "ensure clarity" then whose clarity do we speak of? You either use it, as a rule, or you don't, as a rule. If it's ever needed to ensure clarity then it must be used consistently...not at the whim of some editors, or printers, or editors and printers, or authors and editors...
