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You could ostensibly get a warforged item from a world quest daily, just a very rare chance.
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It's not completely random, due to reward chances in the various activities.
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We want you to have a choice in what you want to do but still be able to get a good reward from what you want to do.
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There are multiple ways of getting equivalent items - missions, rewards, new CMs w/ dungeon keys, raiding, heroics, factions, pvp.
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The goal is no matter what you do, you can get something you've never seen before.
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The goal is "spreading the wealth" across the game.