Not a fan of just bringing characters back, but even less of a fan of killing off characters just for the lootz.
Zul'jin didnt deserve to die like that, burning crusade didnt do a lot for the lore of the game, fucked up illidan, kaelthas and zuljin, wrote them all off as mad insane and unrelatable villains so we wouldnt feel guilt when we turn them into loot pinatas.
As for the bwonsamdi ressurection thing, i still feel they need to do that to voljin, they royally fucked him over with the broken shore, his arc was pathetic, he came out of the shadows, led the rebellion against garrosh, was promoted to warchief, then swiftly killed off before he did a single thing. Such a waste of a character! Zuljin atleast had a strong story arc wrapped up in zulaman, even if he still had more story to tell. i just hate the introduce > kill > introduce > kill cycle wow has had with its characters.
Not sure where i stand with zuljin getting a rez, i feel like perhaps a new zuljin should rise up, perhaps introduce some new troll characters, i think most races are in need of this. Hell i still dont know who replaces vol'jin as the troll racial leader, who do they even pick from? Rokhan? is that really it?