Sacred Soil does seem really underwhelming as a way to use an Aetherflow stack but it has a really short 30 sec recast time which means it gets a lot of mileage. If it included a healing buff to spell based magic it would tip the scales too far. SCH already have Fey Illumination and Dissipation that can increase their healing potency along with Largesse as a roll action. One of those 2 native skills has to go if Sacred Soil gets a healing buff. Fey Illumination already benefits both healers equally and any DPS or Tank that can cast a healing spell too. If Scared Soil did that as well it would be almost game breaking. I would gladly sacrifice the healing buff in Dissipation tho. I would love to see the fairy fall asleep for 30 seconds in exchange for 3 additional Aetherflow Stacks every 180 seconds. Then the fairy could wake up if it takes damage or Esuna is used and also not need to be resummoned either. Everyone would use Dissipation then.