it's not so much about Unity or other beginner-friendly engines, it's much more about Kickstarter, Greenlight and Early Access (and probably Patreon a bit later down the line, don't see devs using it right now, although some modders do). All of those delegate the task of sifting through piles of crap to end users, whereas before publishers used to take those risks. Yeah, publishers - they actually did serve a function.