The existence of Vercure is primarily there for flavor and mitigation on the overworld. That's really it. BLM has Manaward and Summoner has Titan-egi and Devotion, if you want a comparison.

That said, Vercure can be useful, but most healers find the usage of it to be rather intrusive or an insult to their healing abilities, implying that they're bad healers.

Buuuuuut OP is probably a troll.