Remove lethality from ranged champions
That's all.
That's all.

Lethality's effectiveness was compounded by the rune rework: removal of armor runes. As far as I can tell, lethality is a tool meant to help assassins to burst down targets, not a cheaper and more effective alternative to buying an AD item.
I know it's fun to one-shot any non-tank, but it's not healthy gameplay.