I’m aware that it doesn’t replicate AoE spells in general, but I think this should be an exception. It’s a spell that would normally be duplicated being changed, which significantly diminishes what’s supposed to be a big power moment.
It also feels bad from that the hero trees are supposed to be a splice of two specs, yet Destruction doesn’t feel represented at all. Diabolist feels like the Demonology hero tree and Hellcaller feels like the Affliction hero tree.