Moses was describing a basic principle of life, life goes well for us when living God’s way, by God’s law. Even for Job. In the middle of his story, life was awful. At the end of the book God not only restores Job’s fortunes, they’re even better than when the book starts out. Job successfully endured the ordeal God permitted in his life, and he was blessed.
I think we call it the Fall of Humankind because the first humans were at the pinnacle of human experience, where everything was good, their relationships were healthy and filled with love, their work was satisfying and productive, their resources were ample, the world was their oyster, and their spiritual communion with God and each other was full.