2H paladins did not come "late" to the Warcraft design. Paladins in Warcraft have always been powerful healers, and since Warcraft Three they have always been shown to use two-handed weapons.
Crusaders in real life didn't have magical powers. Saint George is not a Warcraft character, Uther is. Uther is who you look at to see what Paladins are in Warcraft. He is the archetypal Paladin.
All the other Paladins in WoW follow suit. Uther is filled with holiness and knows restraint, heals his allies and can render them temporarily invincible, and uses a might two-handed hammer. Tyrion Fordring (his successor) is a powerful crusader of justice and wields a legendary two-handed sword with the power to smite the undead. Maraad (and his successor Yrel) is the unstoppable fist of the light, whose iconic two-handed hammer is forged from a chunk of crystal blessed by the Naaru themselves, WoW's equivalent of angels.
The only notable Paladin in WoW who carries a shield is Yrel, who is very new to the scene, and even she usually keeps it on her back and wields her weapon two-handed.
Paladins are defined by their implacability, and by being infused with the light, that aids them in healing and in defeating evil (particularly demons and the undead).
Paladins in WoW are at their most iconic with no shield, and two-handed (typically blunt) weapons.
I do not give a single shit what your idea about what Warcraft's paladins are is if it is not based on the game you are actually talking about, which has existed for literal decades. It has created its own nuances about what each class is meant to represent and doesn't need to draw from any other source. The version of Paladins shown in Warcraft is the correct depiction of Warcraft's Paladins, not one from Pathfinder or Dungeons and Dragons or Star Trek or The Crusades or Shadowrun or Lord of the Rings. Warcraft.
Last edited by Imnick; 2015-07-07 at 02:14 PM.