paladins need a way to generate threat while healing themselves/others. They also need some way to further scale their self healing potential. On top of having the worst mitigation of the 3 tanks, paladins also have poor self-healing - with their self healing being nearly unusable when they need to generate threat. Paladins lack major personal cooldowns or "oh shit" buttons like SK and warrior have. Paladins only really have LoH, while warriors have NOW!, enrage, resil and SKs have leech touch and the ability to /s 7 on demand for insane self healing. Paladins also get less defensive value out of vah back because their self healing does not scale with damage like the other tanks. They also get less offensive value because their DPS while tanking is comically bad. paladin defensive stances are non-existant - /s 4 is actually worse or equivalent to /s 3 while also draining stamina. paladins are by far the worst tank class for tanking EXP groups outside of certain undead bosses, paladins are almost always a worse choice than the other tank classes. And even on those select undead mobs, its often better to just use the paladin as a DPS or have them go conduit mode. Paladins need some serious buffs to become a competitive tank options in most scenarios.