There is a simple solution to make AP itemization more rewarding

Just let Zhonyas be a "big AP" item again. Let it have 120 AP (increase the cost if you need to). Or if that's too much let it have 100 AP. Seriously just buff Zhonyas and everything will be fine. And nerf Morellonomicon. That item is WAY too strong considering how cheap it is. Other than that IP itemization is pretty good right now.