Basically skipping high movement/heal mechanics like Pitch Bog II and having a well coordinated group that makes no mistakes and lines up mitigation well is going to result in far better dps. Obviously, getting orange still means you're decent but if you're claiming Dia misalignment is fine (it's rough) and Benison doesn't matter there's more to learn. If WHM had infinite weave we'd use Benison on cd, it's free and may save other resources. But we don't so we dump it on the AST who can CI and ED constantly and use it only whenever a window opens that needs nothing else. Which is why AST is so valuable.
The top e9s rdps kill for WHM has high crit Assize/Misery padding on adds.
Succor in itself is bad, but a 205 shield is good when you pair it with other heals. In the same way 300 potency for a Rapture is "weak", but paired with mitigation and your co-heals oGCD's, it equals enough healing to avoid GCD hardcasts being necessary. It adds up. In a group that doesn't bother with all those 10%'s, you start to notice your resources being stretched or your normal heal plan didn't cut it and you're unsure why.
Curious on your source for a Diurnal AST with all oGCD's healing less than a WHM using all their lilies. Most top kills have AST significantly ahead.
Definitely, WHM's are damage machines in lv80 dungeons, no doubt. But dungeons are so ridiculously easy having that as a strength doesn't really mean much.
The issue isn't that WHM isn't good enough for any of the content in the game. It's "fine". It's just that none of it's strengths, like dungeons or overheal Cure III combos matter. Everything that does matter other healers can do better except WHM comes with multiple weaknesses the other healers don't have.
Definitely. Diurnal AST is miles easier on mana at lv50, having the 8% mp from cards and similar but cheaper GCD heals, while WHM doesn't get Solace or Thin Air until later. ED is generally more useful than Bene too, due to a shorter cooldown meaning you have it on demand more often. It's also far more mobile, WHM doesn't even have lilies to move while AST has full access to Lightspeed and 1.5 sec Malefic.