Alliance/Horde covet the power of each other so hardly, so they found a secret technique to Perma-MindControl Paladins/Shamans to get their power in their troops.
How it would works →
When we create a Paladin/Shaman, we could find a NPC in the openworld that Perma-MindControl us using a secret dark sorcery technique, and then the character being Perma-MindControlled now fight for the opposite faction forever. This way, we can get Paladins/Shamans in both factions.
Ok so you a saying there should be mind controlled orc shamans fighting for the alliance, and mind controlled human paladins fighting for the horde just to make a legit scenario to explain why now horde can have palas and alliance can have shamans?
Instead of just adding a dwarf shaman trainer who says he was spying on the horde to learn how to teach shamanism, and adding an undead pala trainer who says he can remember how to teach the way of light because he was a great paladin trainer when he was still alive instead of an undead?