Winning a game is basically wave control now.
With sucky towers and items like
, even snowballing hard doesn't matter post 30 minutes. In a game recently, one of the pro teams versed a challenger team (I forget which ones) The pro team was up by an insane amount of gold. The enemy challenger team didn't even have the 2nd mid tower and they were able to win ONE team fight and end off of baron buff. 1 fight so early in the game shouldn't decide who wins.