To be fair, I think "healer in FFXIV" is the role that has to deal with the most amount of "rare events." For example:
  • Most parties are not clown cars that stand in the bad.
  • Most encounters don't afflict unavoidable debuffs that can be Esuna'ed.
  • Most encounters don't afflict unavoidable, Esuna'ble debuffs that hurt so much that it's worth while to do so.
  • Most encounters don't afflict bleeds that truly hurt.
If I, as a healer, zone out between unavoidable raid-wides, that's why. There's little incentive to pay constant attention looking for a rare event that, in many cases, won't actually wipe the party.