I came back to Legion just before 7.2 dropped, and the changes are exactly what I was looking for and fixed every issue I had.
1. Limited defensives, when pushing keys with my guild pre-7.2 I would sometimes find that mechanics would be unavoidable and instantly kill me (probably from punching above my gear weight), and I was desperate for Prydaz just so I could do the content.
Solved by the addition of Fortifying Brew, I can't use this thing enough. It also means I can help out with soaking spores on Botanist Mythic and anything else the guild needs.
2. Reactive playstyle, for me the whole playstyle consisted of spam ReM, react to damage with EF, react to procs with Vivify, react the spot healing requirements with EnM. The only proactive ability was LC, but even this rewarded a reactive style due to the 30% HoT buff (target taking damage before use is rewarded).
Now with the mists of Shaohao, I have more to think about outside of the above. Before the raid takes damage I can spam effuse to build up my stacks, spread as many ReM's as I can before the raid damage comes in, and then time the cast of SG so it goes off with the raid damaging ability. (I should note that I use Rin's as one of my leggos, so it does even more healing).
I do wish our numbers were buffed a little, I can only really compete with our other healing team on the meters when one of them dies at the moment, but It's a good thing that our playstyle is in a good place; others specs have it much worse!
My logs:
www . warcraftlogs.com/ guilds/userreportslist/ 195338
www . warcraftlogs.com/ reports/1Zz4MwNATX7vmQPd # fight=33&type=healing& view=analytical&source=14
(Note that if you combine Shaohao, Sheiluns and Shelter of Rin, they healed more than 3x revival casts)
Looking forward to hearing your thoughts.