To comment on Esuna, the absurd number of hoops you have to jump through before that spell will remove anything worthwhile makes it of limited use at the best of times. Being positioned next to party members (which wastes vital seconds running in during fights that matter), having the appropriate JA activated, being afflicted with the appropriate status effects yourself (which you may well resist anyway with the appropriate barspells, and may involve debilitating silence/amnesia/paralysis/addle etc)...
Of course I am not saying that RDM shouldn't have something similar, but it does demonstrate the sort of hoops that SE will put RDM through for removing multiple effects in the name of balance. Something inane like "Dispel II will remove multiple effects under Saboteur if the Red Mage is currently under the effect of the appropriate bar-status and bar-element spells matching the effects to be removed" would not surprise me.
I really like Llana's list of spell candidates, though I think they should remain RDM exclusive. WHM, and SCH in particular, don't need any (more) enfeebling spells, in my opinion. There was a nice suggestion a while ago for an enfeebling spell that added a static "waiting period" to the use of any mob TP moves that might also fit nicely.