If you think DRK doesn’t have incredibly strong survivability when you actually use its skills just tells me you think broken overpowered heals is what count as tank defensives
It’s not hard to solo a boss on a DRK especially now they have a massive excog on their 2 minutes and they still have the inbuilt advantage of 80% damage down, 1.8* the HP and a boatload of defensives like all tanks