Nunu Q change context

I'm just asking why. Really. I can't understand the reason of the changes. Nunu's live Q seems like balanced at the moment and i can't even understand why not only taking power away from the ability (he can no more get the damage buff) but also give this "anti-resource" bar. I see that if Nunu can stack this buffs he can become more tanky, but stiil this seems like a totally unnecessary change, especcially considering that his others basic abilities needs really a little rework to put him back into the game.
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