You can still have two spells benefit from Elemental Mastery. Dont know if thats intended or not but it’s there. Everything else Shaman feels great and responsive, from grounding to interrupts to even Earthbind ticks.
Bit difficult for me to try and raid on PTR, but I think Sapphiron Chill should be looked into. On live, it appears to apply the slow and then the damage in successive batches, which makes it significantly more forgiving to move out of in the meantime. But with a tiny batching window this might no longer be the case