Why was nunu's w changed to 20% ap from 40%?

All the problems that this game currently has. {{item:3147}} being op. Stealth being op. True damage being ridiculous. Marksmen being gutted. Tanks now starting to become irrelevant. Juggernauts in every lane. Jungle changes make playing jungle unenjoyable. Games too fast. Turrets too weak. And the list goes on. Yet here comes this yeti just minding his own business, eating whatever plant or animal he chooses and you decide to hit him with a huge nerf when his play rate is very low and who's primarily a jungler and you nerf him?
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