One trick ponies are BAD for this game's health!!!!!
Adaptation and retroactive decision making are key to being a successful summoner. Your ability to adapt and respond to any given situation is severely impaired when you force a single champion (and, on top of that, a champion that has zero synergy with the rest of your team) into EVERY SINGLE GAME YOU PLAY.
I take a break from ranked for a season and this problem /mindset seems to be at its worst ever. I just finished a game with a summoner who has achieved full mastery with Nasus. However, his match history shows the last dozen+ games of him playing nothing but Nasus and feeding in about 70% of them( and, yes, his win rate is negative). He is an active liability at gold-platinum level; he is feeding consistently as if he was in the bronze tier--that is not okay!..not that this level of play.
Serious question: is it against the summoner's code to link a summoner's(summoners' tbh) name to show just how much of a detriment this tactic and team builder is to League of Legend's long term health? There's no reputable E Sport where you can just "main" a certain role outside of coordinated play; why would League of Legends be the exception?
Please, for the love of all that is worth loving: leave the one-trick-ponying to Diamond+ players.

but playing the master of evil
is too hard to give up