It's more of a problem with the servers snapshotting you into a Dark AoE even though you're out of range of it on your screen. It's better to throw guard up, and hope that also doesn't get snapshotted. Since we can make the assumption that the server tick rate will remain as awful as it's always been it that problem probably won't go away.

But purify should be more effective than it is, it should work against MoN, and should mitigate draw in/knockback effects. There should be a point when you've been CC'd enough that you become immune to its effects for a short window.