I was originally going to reply to complain about the complainers, but is it really that hard to add a repeatable "Heal for 500+ HP" objective as an analog to the "Deal 500+ Damage" objective?

I guess they were afraid of people exploiting it for fast Sparks or something, but considering how even a one-handed melee with critical hit bonuses in Abyssea can complete this in a matter of minutes, I doubt that's really a concern anymore.