Not reading anything else at the moment, just different thought:

If it was SGE instead of WHM, would that make people feel better?

1) SGE is a new healer which has only ever existed under the current model with its current kit.

2) They could make an option for new players to start as SGE at level 1 on their first character if they wanted to (this is more work, but less work than changing the healers. And for people with high level characters, they could start it at 70 just like today to pick up a new healer.

3) They can shift its kit to make its healing more straitforward and powerful to better fit the "easy to learn" idea than its present incarnation (level 70 dungeons before you get Panhamia say "Hai! o/")

4) SGE is already nearly a carbon copy of SCH, so there's a lot of overlap in both class fantasy/identity and present toolkit, meaning players transitioning one way or the other would be the least impacted.

5) People playing SGE chose to play it the way it is from the start. They had no notions of complexity (the people who did largely swapped to SCH), nor did they pick up the Job when it was complex and have that ripped away from them without a say (like SGE)

6) It has direct heals right now - it has Prognosis where SCH has no equivalent.

7) It wouldn't be that hard to make it more similar to current WHM. Boost the potencies of its direct heals (non Eukrasian Diagnosis and Prognosis), probably Prognosis by 100-150 (up to 400 like Medica or 450 since there's no Medica 2 here) and Diagnosis to 600-800 (Cure 2), and make Toxicon damage neutral, which is something people already want which would reward using GCD heals. Could make GCD heals trigger Kardia, as some people have asked for, though I don't know if that'd be strictly needed.

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Nothing too complicated, it wouldn't anger all the people you fellows believe picked and play WHM and want a more complex rotation from it. It would be more complicated than just doing it with WHM, but some of you seem to be highly convinced the aesthetic of WHM needs to have a complex damage rotation and should be a harder Job to play and optimize. SGE with Cure 2 and a proper Medica would be easy enough for new healers to pick up and having an option to start it at level 1 (as a starting Job if new players wanted to pick it) or at level 70 (for existing players who are at or above that level and want to pick up a new healer) to pick up and play, and as long as Diagnosis and Prognosis can sustain a party, low level players or new healers leveling through ShB would have those strong tools to fall back on to make it a good choice for new players/healers, too.