PSA: If your team is snowballing, PUSH AND END THE GAME QUICKLY!
These are just the thoughts of an unranked player. I am not the best player out there. I am not even in ranked. But I do know this: Pushing and ending the game quickly is far more important than just farming kills. Sure, farming kills means you won't be 9/1, you'll be 39/9, but letting games go on too long will cause the enemy team to catch up in not only gold and kills, but OBJECTIVES as well! Being 39/9 means absolutely NOTHING if you haven't even taken out their inner turret! Pushing and ending games quickly while you have the advantage not only means putting the enemy team out of their misery, but it also means negating their chances of coming back because they can't come back very well if they're behind at 15 mins, but if games go on for 35 mins, they can come back BIG TIME. Look at LCS: You don't see them farming kills when they're snowballing. You instead see them pushing and taking turrets after getting kills and gaining more map control. So if the pros do this, then why don't most people do this? Just my thoughts.
TL;DR: If you're snowballing, just push hardcore and end the game, there's no need to draw it out.
main speaking.