When conqueror gets nerfed
When conqueror inevitably gets nerfed, as it is currently BY FAR the most popular rune -- source: https://www.leagueofgraphs.com/champions/runes -- it would be nice to have the damage portion of the rune nerfed and not the sustain.
Riot has a very clear predilection towards doing the opposite of what I'm suggesting. It's nice to have a rune available to drain tank, and to actually have some champions be tanky again because of it (Shen, Aatrox, etc)
Please nerf the damage, not the healing, if/when (when) it gets nerfed.