No one buys deaths dance anymore because Conq is a free deaths dance.
Idk how this rune isn't either reworked or removed entirely. It's literally a stat check (AD/AP), something people hate on champs/items, and then 15% healing and at that point it's even more of a stack check and to an extent and item check to see if you can kill them. Thing is, it's not realistic to have healing reduction that early in the game until your 1st-2nd back, depending.
Idk why the conq healing isn't scalable, or again, just remove the rune. It's easily one of the most uninteresting keystones yet one of the most powerful. Each season, no matter the changes, it's always insanely popular.