Why does a Supertank with late game scaling fall off so hard?

If you haven't guessed it by now, I'm referring to {{champion:14}} His early game is a force to be feared, his mid game is not the worst, but when late game hits and everything is moving at light speed he becomes extremely ignorable :( All that health stacked, just to get ignored lol. I think the biggest reason is his Q takes a full second to get the knock up which is his only hard cc(and reason to fear him), aside from his ult which is really easy to miss unless standing directly next to the target. Maybe someone can make sense of this for me?
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