Would you suggest making it harder to develop games?

Nintendo tried that with the Nintendo 64:

Yamauchi took a different approach with the SNES' successor the N64, however, which was released in 1996 at least partly to distract attention away from the disastrous Virtual Boy. Yamauchi admitted at the 2001 Space World event that he had deliberately ordered the N64 be difficult to develop for. The intention behind this was to discourage untalented third-party developers from releasing poor-quality games -- it was no longer practical for Yamauchi to personally approve every game -- but the plan backfired somewhat: given the commercial success of previous Nintendo systems, third-party developers were still keen to get their games on a Nintendo console, and this consequently led to a number of sloppy, low-quality third-party games that clashed significantly with the high-quality first- and second-party titles that were being released on the platform.

(from http://www.usgamer.net/articles/hiroshi-yamauchi-the-iron-fi... )

I don't. It Unity's goal to enable as many potential developers as possible. It's also their curse.

What you're saying is true, but it doesn't matter. Good games with good performance float to the top, get featured, get shared, get popular. Not so good games fade away, and hopefully the developer learns something and tries harder next time. It's all good.

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.