If you want to balance the game towards LCS, why not give LCS its own balance system?

You might think that's stupid but I'm dead serious. Hear me out.

Balancing the game to higher elos makes sense because of two points:

1. More competitive players will use every overpowered tactic to win while casual players are less likely to.
2. There's no point in climbing the ladder out of Bronze if higher elos are balanced worse.

But Riot likes to balance to the absolute highest tier of play: Professional. While this might work in other game genres (there's a lot more mechanics to League than, say, a typical FPS), the skill presented in Worlds and the skill presented in Diamond are vastly different and anything lower than that (over 99% of the playerbase) suffers.

If the game was balanced around high-ranking non-professional play like Diamond or Challenger with a separate balance system existing in Worlds, the majority of the players would appreciate the game more. The insanely-skilled professionals who are payed to play League would receive a special elo where they play against eachother and similarly skilled players and that elo is balanced differently from non-professional play.

If you still don't understand, here's an example (and keep in mind that this purely hypothetical):

If is considered weak in Diamond and below but some wonky off-meta playstyle is making him absurdly powerful in Worlds and not lower elos, you can buff the for low-elo play and nerf the LCS so those who just play the game for fun can enjoy a balanced while he isn't simultaneously dominating Worlds.