as the tank get more and more hp i think the fact to bring back the dark knight to 100% hp is crazy, he continue to take damage and if the healer can't get you back full life you are done for. personally i avoid to use it, i prefer die, it's more a bother than a help. only a white mage can really deal with it efficiently. i feel they need to reduce the goal of 100% hp to 60-75% hp for be more realistic.
because soo far, LD can kill you and that not normal for a cd of last hope.

indeed holmang make you unable to move, but at the end of holmang you will not drop dead because your healer (ast/sch) can't get you full life in time. plus, the warrior have a couple of skill for get back hp far more efficient than DRK. as tank i find LD too much a pain than being a CD of last hope...

other QoL that i want to see come is when you are out of fight the aura must'nt consume mana... it's idiot. we can still cut it, but since it cost more of 1200 of our mp for put it back is kinda pointless. and i still fail to understand why as dark knight we can't have dark aura that will drain life or mana of the enemy surrounding us... the mana regeneration can be a pain, especially with a white mage (while the pack pull) if it spam Holy, bye bye the mana since the enemy are stun and don't attack you. (and tell me don't use AoE, Holy generate tons of hate)