WHM questions when to use Holy, Aero, Cure I etc.

[IttyBitty]

This is why Aero 3 being pruned really isn't that big of a deal. It actually made more sense to use on bosses that are single target than packs of trash, because trash melts too fast to take advantage of Aero 3s duration. You were better off using those GCDs on more Holy.

This is absolutely flat out wrong. Aero 3 beat Holy after 4 ticks (~12s, ie 50+(40x4)= 210 potency per enemy v Holy's 200 [not even taking diminishing returns into account for this comparison]). In pulls of 3 enemies, it beat Stone 4 after 1 tick (~3s, [50x3]+[40x3] = 270 vs Stone IV's 250 in Stormblood) and 2 enemies in 2 ticks (~6s, [50x2]+[40x2x2] = 260). Only the trashiest of trash (usually adds in story mode trials) died anywhere near that quickly.

Even if stuff died before Aero 3 completed its full duration (little generally did), so long as it lasted at least that long? It was better. Anything beyond that was free damage.