As of Writing this Zul’farak has One Bug that needs fixing to make it 100% completeable everytime regardless of how skilled or new a player running it is. The Issue is with the Boss that is triggered once you clear the mob at the Top of the Pyramid and Nekrum and Sezz’ziz spawn once all of the mass of enemies are dead then you have to talk to the Human NPC who has the Sword and Shield to trigger that Encounter which inturn sends a Goblin to blow up the Door leading to the final boss.
But I have been in 3 or 4 runs from the First Classic set of timewalking and this Set where people forgot or did not know to do that so the dungeon cannot be completed. I had this happen 20 minutes ago and we lost 1 tank got a new one we cleared 3 of the optional bosses and trash and I decided to leave. I was in there over 5 minutes before Leaving since we well literally had too since glitching past the door and going to the last boss does nothing since the Door not being Opened did not trigger them I ended up getting the Deserter Debuff. I have not looked into how long you have to be in a dungeon before that no longer triggers when you leave but I think Blizzard has made it go past a 5 minute timer.
If anyone knows the minimum time for Deserter Debuff to drop off please let me know. But yes I would prefer that this Dungeon not Make a return once Wrath Timewalking Ends. I know they can fix it but Removal of Zul’farak and putting something else or even a full Rotation change since doing 2 Dire Maul 2 Stratholme and Dead Mines is pretty bad choice wise we could of had a better choice of dungeons seeing there is quite a few for Classic, Same ges for all other Timewalking Blizzard need to Rotate every Dungeon into Each event to make it less monotonous.