Maybe there was once a time where a single player could carry through their lane alone. Those days are dead. Now, all it takes is a bad player to COST a team the game. Bad players have more of an impact than good players ever will. You give a team a yi that consistently goes 4/10 and loses games? Well if everyone else doesn't absolutely destroy their lane, they're going to lose. But riot doesn't care. It's a "team" game, and whichever team has the weakest link loses. Simple as that. Look at esports too. You don't hear about one player CARRYING the game, you hear about the one person on the losing team COSTING the game. It's a terrible system.