One sacrifices significant healing over time and access to Fey Illumination, Whispering Dawn, Fey Blessing, and fairy tether.
The other sacrifices an instant-cast Broil that may carry a single-target damage-down debuff of at best 20% uptime.
See why sacrificing the one for Aetherflow would be mildly "situational"... but the other's sacrifice would amount to awkward-but-obligatory hoop jumping, since the relative cost is next to nil?
I'm aware, though admittedly I'd forgotten that it also affected Intelligence on ACN/SCH/SMN (and only Strength and Dexterity for others), unlike the later Addle. I still don't much care for having to look at the target's buffs to track when you can next spend your instant-cast Broils (Ruminate) for their full effect.Virus was an old cross class ability that SCH/SMN used to have that would apply a damage down debuff to the target for 10s but made the target immune to the status effect for 60s after it was finished.