So I was just sat during progression for the first time ever purely because Elemental is shit. I took the least amount of avoidable damage, but when a 5th healer was needed that really wasn't taken into account. I know Blizzard tries to cater to a wide variety of players, but why don't they take into consideration Elemental Shamans raiding Mythic? So many conditions need to be met before Elemental is actually viable on many encounters in HFC.
Your class trinket is needed before you're even remotely viable on Hellfire Council, Tyrant, Fel-Lord. (Any single-target, council, or sustained cleave encounter)
To actually do well on Hellfire Assault, Kormrok, Xhul'Horac, and Mannoroth the cleave of your raid needs to be relatively weak.
And finally I have no hope for Archimonde. The only reason Elemental even looks "OK" on this encounter is because we have phase 2 to catch up.
We're absolutely not viable for Kilrogg and Gorefiend. Far too much target switching onto targets that don't live long enough for your DPS not to suffer.
Even watching other Elemental Shamans with their 4 piece and class trinket they're destroyed by many other classes. I don't want to be top of the meters, and it's unreasonable to think we ever will be. I'm fine with that. At this very moment though, I've never been more convinced that whoever is in charge of class development and balance plays pure DPS classes.