Smurfs in this game
My god. Probably the most annoying thing to play against. I wish league of legends actually gave worthwhile rewards to people who play one account- instead its just long queue times. It really punishes and makes the experience of someone learning the game awful. It makes the skill disparity between players in the lower brackets so noticeable. I am not saying it is something that is preventing me from climbing. Its just an awful experience going against someone who is very seasoned, and I believe adds more toxicity to the already toxic vat of the solo queue.
Again I don't think that smurfs prevent people from climbing. Its just so detrimental to the experience of having good competitive games. Solution? Reward people for continuously playing one account. Maybe adding swag after achieving diamond like t shirts, hats, and other swag. Having ip rewards after X amount of games played continuously on an account. Having individual champion ladders in the game that show individual mastery on a champion.