Huge SMN nerf: we're losing Thunder

[Sayori]

Ok, I can cast 2x Ruin II for a total potency of 160, or I can cast a Ruin II and Thunder for a total potency of 320. How does ruin 2 spamming instead of casting thunder raise our dps?

Keep in mind that dots ticks can also crit, so there's no benefit to using Ruin II over Thunder.

Then again.. this nerf is not even close to a "Huge nerf"