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Where do i say it makes you bad? I say the exact opposite?

As far as if i believe everyone is at a level the belong at then yes they are. There are many many reasons we are at a rank/MMR we are. Now is rank perfect? No but you assumed I meant based on your rank is why I would recommend not playing high skill cap champs, rank is simply a representation of MMR, the MMR is what I am actually considering, IDC if you are silver or bronze or never played rank, the MMR for you, according to OP.GG is 1,059, a bit above your DIVISION, however it is no insult to say a low/mid elo player cannot play a champ to their full potential.

As far as your point of depending on team comp it is actually irrelevant, if you play Annie there are very few ways of making terrible plays and losing the game, especially when compared to the likes of LB and Zed, while you can play those champs and be passable at them, if you want to climb, you will see more consistency from Annie and other simple champs, because their kits allow for many mistakes to be forgiven, where as a misstep of LB is much more punishing. If you are not playing a champ to its full potential you are really only hurting yourself climbing, you can take offense to it or whatever you wish. But this is all backed up by stats, how many "fed" LeBlancs and Zeds and Rivens and any other difficult champ do you see a game lose? How many simple champs, Annie Ryze Renekton Ori, Lucian/graves? In lower elo it is much easier to snowball and win off champs who are simple, because their kits, while they give less outplay potential also are much more forgiving.

Let us say the skill floor for Teemo is 30, these numbers will be completely random, the best Teemo in the world can only take his skill cap to 75 and an average Teemo plays him to a rating of 60 now lets compare a LB. Let us say LB has a skill floor of 10 (because if she is played wrong good lord is it wrong and terrible and no chance of good things) but the average player can play her to a skill of 40 , but her skill cap is 150, while the LB can be taken to unbelievable heights, can YOU or any low elo player (INCLUDING ME) take her anywhere close to 150? The answer is no, however can we all play Teemo/Annie/Ryze to a better average skill rating? Yes, because the champs themselves are very hard to do badly on, for example if you compare the absolute worst Teemo player to the worst LB player the Teemo is still going to be better, because as bad as they are they have to almost DC to be worse than a player on LB unable to play her. Now how does this apply to climbing? Very simple, you are going to have bad games, now would you rather have bad games on Annie and Teemo and still be capable of helping and playing at a better skill rating, or would you rather be on a 10 skill rating LB? Obviously the numbers are fictional however the point has been made even if the numbers are purely random. The point being purely to climb, simple champs give fewer bad games, meaning fewer loses, as you lose less and climb you will learn more about the game, making you better, to where you can begin to handle the LB and Zed.

Another analogy I have heard is from pokemon, let us say Zed/LB are Mew, and Silver is a trainer with a rank 5 badge, sure Mew may do what you want most the time, but he will also sit there and do nothing no matter how much you scream and yell and want him to do something.