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Yunzi, with all due respect, the general trend I noticed around here and in other places where the spec is debated is not that: " Did the off-tank go down, thus being unable to taunt swap resulting in the main tank taking more damage than usual? Now we have the option of Shadow Mending him, taking away from Power Word: Radiances later in the fight, or letting the other healers adjust their spell selection instead.
Plea's variable mana cost is helpful with respect to judgement. Are we anticipating upcoming damage to random players? In that case we keep our number of atonements low so that we can cheaply Plea players who need it. Normally we maintain 5-6+ atonements constantly."
There is little choice in disc really. Spot healing is not our forte, neither is tank healing. You do raid healing, more or less bursty kind. You're seriously overcomplicating a rather simple spec: you setup atonements at specific times, dps to produce the actual healing. The hard part is learning the right moments and having your team working with you, not against you. This whole philosophy you're trying to develop with shadowmend being a choice in raids is simply not there. When I debated our spot healing, the simple reply from the disc community was "roll holy". Both shadowmend mana cost and plea design are things that keep us locked into radiance the vast majority of time in raids, and quite frankly, alienated me from raiding as disc.