[Raigen.Convict]

Come on, Raigen. You know well this is entirely untrue. I've seen Spellthieves who run high DEF/RES, Evasion, and [strike]Leeched Energy[/strike] Margin Manipulation for godlike tanking, and it's not like anything in the game tells them, "Well, you can't run Western Wind in that case." That's an extreme example, as would be Skyburn-abusing Demon Hunters, but there's plenty more cases than those two even...

In the spelltheif case, there's not much a priest can do, but counters like that are part of balance. It's far from invincible. Same as the Demon Hunter case.