You know another major downfall of trolls, intentional feeders, broken champions and loss-streaks?
As you go down in winrate and are matched with people who have a respectively low winrate or a similar MMR (which only happens a quarter of the time anyway) you run into this massive issue where anyone with a positive winrate will dodge, thinking everyone there is a feeder or troll.
It's not something minor; You will get more toxic teammates, and you will get more people dodging your games, and fewer people actually playing them. It makes winning harder because all that you're left with willing to stay are either the carry smurfs or the 15% winrate Electrocute "Lethality Works Guys" Urgot.