Why is Morgana mid getting gutted? Why?

Dark Binding (Q) AP ratio lowered from 90% to 75% Black Shield (E) AP ratio lowered from 70% to 40% https://m.u.gg/lol/champions/morgana/build/?role=middle According to her winrate and playrate, there's no reason why she should be nerfed, or at least this hard. It just doesn't make sense why you continue to nerf Morgana when the data is there.
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