All classes have their class specific items only for them:
Barb has Band of Might - 80%
Necro has Dayntee’s Binding - 50%
Demon Hunter has Wraps of Clarity - 50%
Wizard has Halo of Karini - 80%
Witch Doctor has Lakumba’s Ornaments - up to 60%
Monk doesn’t have item also but Epiphany has it 50% and it is much easier to keep 90sec cooldown then Akarat’s Champion 120sec cooldown and it doesn’t have damage reduction. Just increase armor.
What Crusader has? Nothing. Only Aquila or unity or Endless walk set. Those are all items for all classes and not specifically for Crusader class.
Do i miss something?
Crusader should be as tough as Barb but it is the opposite. He is glass cannon. Almost no damage reduction items and almost no way to heal himself.