Nephi said, "My soul delighteth in the words of Isaiah" (2 Ne. 25:5), but he also said, "My soul delighteth in plainness unto my people, that they may learn" (25:4).
Plainness? Isaiah? Raise your hand if you found Isaiah "plain" on first reading. Anyone? No?
Yet Isaiah was not writing allegorically, where one thing always means another. He used metaphors and analogies, but their meaning was instantly clear to the people of his time — they were used for clarity, not obscurity; to reveal the Lord's intentions, not conceal them.