Didnt read the whole thread (on my phone atm) but I've said this over and over. Healing is faceroll easy in this game. Even in the "hardest" content you have time to DPS as a healer. If you aren't DPSing then you're sitting there doing nothing...and people get upset about that.
Nerfing cleric stance(90cd etc) will do nothing but make people expect healers to DPS more. Stance dancing wont really exist so people will expect healers to DPS without it. Standing there doing nothing still wont be accepted.
The only way to fix the meta is to make healing harder. More healing or nerf healing or both. From the video samples I saw of stormblood, that aint happening though. I doubt SE will ever fix the problem.