If a Warlock could learn stormtrance by meditating, why couldnt they also learn Bladedancer or Fist of Havoc?
If a hunter could learn to use the voidbow by taking a fallen allie's last bit of power, why couldn't they do the same with sunbreaker?
If any class can master all 3 elements, why wouldnt they be able to learn to mold the energy into any deadly form they want?
*this is a lore/story based question as its obvious why this isnt in the game
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It is possible that they have a different type of light archetype, and that is what determines their class. Think of it like Myers-Briggs personalities. Some people are just better at certain things. Hunters don't seem to be good at producing large amounts of Light, like what might be needed for Nova Bomb or Ward of Dawn, but they seem to be really good at focusing their power. Golden Gold doesn't use the same amount of power as Radiance, but it is so condensed it can cut through solid rock. At least, that is my theory.