I ran a full sim yesterday using the Raid Healing script for resto shaman. The results are surprising. All other sources I can find indicate that the state weights should be as follows:
Leech = Avoidance
Versatility = Mastery
The sims for Mythic + and the Raid Healing script keep pushing mastery as one of the top stats. Other than the argument that “our sims run different to others” why would it determine in a raid healing setting that Mastery would be top?. In our case, it is highly dependent on burst damage which isn’t very effective in a raid setting.
Here is the link to the sim. Maybe someone can explain in more detail how it comes to it’s conclusion.