Anyway,

Dark Mind and Dark Missionary are weird. Dark Mind is simply outdated from old tank design where Paladin was physical mit and DRK was magical mit while Dark Missionary is directly one to one shared with Gunbreaker.

Dark Mind should just straight up do something different, maybe a barrier that trait upgrades into TBN or something so DRK can't be polarized based on if the devs decided to make a TB magic.

AoE barrier utility for Dark Missionary is already taken by other tanks so what if it was actually a party-based personal damage boost like Meditative Brotherhood (Monk gains chakra when allies use GCDs) and instead defensively DRK got a shorter CD on Reprisal for raidwides (they actually invented it)