Elemental Staves & Wands Known Issue

Bishops:
Only class with a an ability to heal the party almost unconditionally. True, but some bosses have zombify.
55% Critical rate with most skills, 75% with Genesis. Arch Mages have Amp and Booster, both of which provide a far greater boost in damage. I/Ls have innate critical with Chain Lightning and F/Ps have DoT.
Holy Symbol, an impossible to replace and extremely effective buff. HS Mules
A Party buff to protect the party from stats effects. All Cure Potions
Ressurection (Evan's can revive party members, but the method is an autolife buff on random members and operates differently) Soul Stone can buff the entire party after Chaos. That and wheels make Resurrection almost useless. Resurrection's only saving grace is that it doesn't cancel buffs upon revival.

Bishops aren't as great as you think.