Ugh! Between the fact that there is no new Seasonal cosmetic reward(s) and a Seasonal buff that pales in comparison to Season 16 and Season 17, I might skip Season 18.
Patch 2.6.6 is mostly inconsequential to me, and amounts to little more than a different weapon being equipped on my Enchantress follower. And as much as I would love to swap out my Legacy of Nightmare rings for the new legendary gem, there is literally no way that I will be able to reach Greater Rift 99 and upgrade the gem to level 99. 
And a big THANKS for not adjusting or removing the Blackthorne’s set. Everyone loves it when that drops. 