The reason too much early snowball is bad for the game
In addition everything else, its also has condition players to want to quit very early, despite a victory being possible with a good group fight and focus on the fed champion that is making everyone want to quit so early.
I would say that the majority of games where the team surrenders at around 20 minutes are winnable, but the players cant see it because they quit so much so early that they have no idea whats possible and WHY its possible.
So thank you Riot conditioning players for an entire season to be quitters. GOOD JOB.