The game should be balanced around Diamond 1+ play

Minimum.

All this talk of what is OP in worlds, what is worthless in worlds, the lack of champion diversity in worlds. It is all solved if the game is balanced around high levels of play. The game would be balanced, worlds would see more diversity, and Bronze-Gold would remain relatively the same, a wasteland of imbalance where people don't know how to play hard champions and think they are weak because of it.

Plat and low Diamond might suffer a bit at first, growing use to the changes, it would see a meta shift, but otherwise stay relatively the same.

Increase bans to 10 to compensate lower levels of play(where I am). Problems solved.