late game is a skill that many people don't have. It is the most strategic part of the game actually, and your movements around the map dictate whether you win or lose, not the actual fighting. This requires concentration, patience and thinking. It is also vital as a jungler to be prepared for and to be good at late gaming due to smite. Not being good at late game means you will keep wondering how come it feels like the game itself is against me, while being good at late game means that when the clock hits 40, you will know what to do and will know what it takes to snowball a minor teamfight advantage (even a single burned flash) into gg.