I've long believe riot balanced around the meta the devs liked playing...
and the way they balance TFT confirms this.
What was unanimously the most broken and hated synergy from set 1? glacial... so what did they keep for set 2? glacial.
Olaf was unanimously hated and broken by the community in set 2 so what does riot do? do they nerf him? no, they actually buff him.
Predator and Poison is too strong for a 3 set bonus you say? better nerf the only counter (kindred) inferno AND shadow.
Riot's balance team constantly goes against the grain with designs and balance choices and the only explanation is that they don't actually listen to the community at all. Instead they just balance around what they enjoy playing.