One trick ponies are toxic to the game
Every single time its a player that's been playing a really long time, has no idea how to play, and thinks they do since they have been playing really long.
https://gyazo.com/5c1fca18e8f3eba5443171c61e9e952f
^great example of one. Toxic player if forced to off role that cries if you don't gank his lane where he picks a losing matchup with an awful champion. Ofc I'm not going to gank negative win rate kat's lane when ori is shitting on you? I'm going to help competent players and hopefully try to carry you. Doesn't matter if you are mid or adc if you are incompetent you wont carry the game anyways.
Always just a toxic experience playing with one tricks and they are usually only in their elo they are in because they know more about the champion than their opponents since they play it so much. Usually one tricks should get high elo as well since they have hundreds of games experience where players in low elo have prob only played against it a handful of times. Otherwise you give these players new champions and bam suddenly they lose every game and cant play! Why? because they know who to play the champion (barley) they don't know how to play the game.