I agree - balancing on anything except competitive play is a stupid, counter-productive concept. You should never under any circumstances be making balance changes based on low MMR players. Akali is a great example of this, so is Riven, so is Diana and Kennen and anyone else that's been "balanced" in the past two seasons that aren't top tier competitive picks. All of the above have been at BEST comfort picks for a handful of players, with the exception of Kennen just now - and even now when he's kinda popular, he holds a 50% win rate in LCS.
None of the above are hard to beat if you have two simple abilities:
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learn how to stop dying after you've died once through a combination of vision, not overextending and good decisions (like giving up outer towers when you can't defend them or can be dove). You might say "but I need to farm" and you'd be right, but the catch is - you need to farm WITHOUT DYING. If you die then you have negated a minimum of 20 cs you gained and given that to the enemy team. It is better to not farm at all, or to give up your lane and go somewhere else if your team can't help you...than to die 5 times in the first 15 minutes of the game. No amount of farm will stop your lane from winning every other lane, if you lose farm and lose towers all you've lost is that, the other lanes still have a chance. If you feed you're virtually assuring that your team will lose unless their team is also feeding.
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know how to coordinate (read - group) with your team and cc/focus the right targets. How do you group? You leave the other lanes and jungle alone UNLESS either an inner/inhib tower are in IMMINENT danger of being taken (an enemy is actively pushing to the tower and no one is in proximity) or the enemy team is entirely accounted for with vision and NOT grouped. Champions like Akali and Riven especially are WORTHLESS without kills if you can even slightly pressure them to deny farm. That's why they snowball so hard with kills, they rely on them. Same with Talon, or Leblanc or Zed (who farms well but needs kills to stay ahead of your itemization).
If you can do those two things and learn how to itemize/lane without being overaggressive then you can shut down any pub stomper champion. I played a good amount of Riven s3 in ranked 3s and solo queue. I had a 70% win rate with her, my win rate when a Riven was on the enemy team was 85%+ because I knew how to play her and so I knew how to play against her.
Also, matchups are super important - learn just enough champs to have safe picks for anything you might face and focus on getting amazing with those. Forget "meta" picks and forget "counter" picks unless they happen to be champions you enjoy already. If you look at the games I get top lane over 90% of them consisst of: Renekton, Jax, Lissandra, Riven, Darius and Kennen (and likely in that order). I can play a lot of other champs top, but those are the ones I know best and one of those can win virtually any matchup I might face in lane and can work in almost any team comp. I specifically chose Lissandra and Kennen because I also played them mid when I wanted to main mid (I played a mean Kha and Diana s3). Unfortunately both of those champs are now suddenly popular for some reason :(