I think we need to reduce healing/power on keystones.

Look back when we had runes and the old 30 point system mastery tree (before thunderlords broke it). It was a healthy system. Not every single champion and their mother can sustain themselves in lane, giving everyone a niche. There were certain trade offs on how champion with in built sustain in their kit like Xin or Irelia had strong early/mid, but fell off late. If we revert back to the old tree, many stupidly broken champion right now that abuses conqueror + domination would be in a healthier spot.