Quality over quantity, I'd say.
At the end of the day you are still spending majority of your time 1 2 1 1 1 1 1 1 1 1 1 on all four healers. It's ridiculous and beyond lazy. They can do better, they had been better. They SHOULD be better.
- Sure they have Toxikon II, but they are treated very similarly as Ruin II/Lily management and thus isn't part of a SGE's routine.
- Sure they have E.Dyskrasia which no other healers had its equivalent in their present iteration, but realistically speaking, when do you even use this outside dungeons that has bajillion targets to DoT - which also amounts even less? While in theory you can E.Dyskrasia first pack then spams Dyskrasia, how many times do you think we'll miss them due to location desync? In the end, running together with tanks as you E.Dosis III targets one by one is still more reliable; the same routine you do with their siblings as well.
- Sure they have Pneuma, but not only it's not a dps gain (just to correct you there mind you) it's also treated as "Cure III but DPS neutral" unless you're cleaving multiple targets, which is also a rarity in 8-mans...
- Phlegma is the oddball (pun intended), but in practice they're still too same'y as combination of Assize and Afflatus Misery given how suspiciously close they are in potency to the latter and its cooldown being adjusted at the same time as when Assize got knocked down to 40s.
- I personally could even go one step further by considering Psyche to Aetherflow's equivalent as "another button I press every 60s, no buts", except Psyche requires no thought while Aetherflow requires conscious decision from my end to spend them for EDs when not needed. But this is just me-thing.
P.S. SCH still holds the top spot on having the most number of oGCDs amongst all healers, just to correct you a bit there. I'm not even counting how Summon Seraph changes into Consolation here.