Even in lieu of that new info, I still only see Sacrifice as very situational only because of the fact that Esuna is self-cast only.
It's very annoying having to run in to remove status debuffs. Any time something is spamming a bad AoE, ie: Wivres, triple bats, worms, leeches, I just tend to stay close to the melees for Esuna spam.
On some mobs you do not want to stand in AoE range.
I agree for situations like in Einherjar it is indeed better and easier to do so as the AoE doesn't do much damage but does hurt the group's performance if detrimental effects like Attack or STR down stay on.
However there are these situations where you do not want to be in AoE range because a dead mage won't cure anything!
Nightmare Taurus' in Dynamis Tavnazia come to mind or some of the Einherjar bosses.
Otherwise there are Wyverns or undead dogs with their too potent Paralyzing AoE moves that leaves you and your party crippled because you're unable to even remove your own paralyze.
Sacrifice seems kind of like your "oh-shit" button, usually if it's about 2-3 spells it's a lot easier and more efficient to spam regular -na spells on your target, unless it's a lot of erase-able effects.
Paralyna I still do with good speed, if you have enough haste on your -na spells you can get them down to 2 seconds allowing them to almost be chain cast.
Personally I use Sacrifice quite a lot, because it's mostly a cure all spell and most detrimental effects do not hurt my own performance as much as it would a tank or melee.
Them first, me later and who the hell cares that the white mage is blinded!
Also handy to know is that you can absorb debuffs that are already on you.
I cast all my -na spells in a capped haste build, so yeah for light effects I also rather chaincast a -na spell.
Poisona and Paralyna are two such fast casters.
But some effects simply need a faster response and some spells simply do not have a fast enough recast time like Erase, Blindna and Cursna, even in a capped haste build.
For those situations Solace -> Sacrifice -> Misery -> Esuna is a god given, especially on mobs that leave behind more then one effect like Soulflayers.
And when shit really hits the fan we still have divine veil.