Yelling at teammates for building or playing wrong is a non-starter. That's not Riot's fault.
Maybe the fault is shared, but players quitting the game is still primarily the fault of dickheads who yell at players who know less than them.
idk, I remember being a new player in 2011, and after the tutorial, the only items I looked at were the recommended items, which compared to how they were back then, have improved drastically.
Wonder if this was why Riot is updating the tutorial...