Pretty sure people already mentioned and repeated the same thing I'm about to say (I just don't feel like fighting with my work just yet):

In battle, it's mainly for pre-shielding incoming damage to lessen the hurt.
For example, second boss, I believe, in Vault (been a while since I've been in o_O) - one of the attacks marks a random player before applying some terrible hurt. I can't determine if the person will survive it for a pre-casted cure to even matter - especially if it's a caster/squishy - so I would try to SS them and follow up with a cure II.