And you don't think being able "to make copies cheaper, faster, and more reliably than before." didn't make a major impact on the development of English literature? for the first time books were available to the masses, previously even the slimmest volume took a year or more to produce, now a printer could knock off hundreds in a single day. Movable type changed *everything* about producing books and in turn this had a gigantic impact on English literature.
Their exact roles in their respective companies aren't going to line up exactly, in the 80's Jim Shooter who was editor-in-Chief closest counterpart was at DC was Dick Giordino who was Executive Editor, the companies were organized differently. Schwartz was the man who saved the Superhero genre which had withered away to Superman, Batman and Wonder Woman by the late fifties. The other ediitors at DC followed his lead and this led to the Silver Age and tremendous Sales success for DC, Marvel in turn directed Lee to create a team book to compete with the very successful JLA, point I've raised multiple times but no one has responded to. the Thread has already acknowledged Kirby's huge role in Lee's success and Jack freely admited he reused many elements from Challengers of the Unknown in the Fantastic Four.