Why the Zac ult change AGAIN?

I can't figure out what they want from Zac. The new ult indicates they want you AP but the Q and W nerf show you want tank. I just can't figure out why they are changing his ult for a 3rd time. He's rarely played as it is and the current ult is great for setting up team fights and compliments his E well. Personally, I think the old and new one should be combined in some way.
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