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Author Existence Failure: Tolkien died before he could finish it. (But he spent years and years fiddling with the stories, so the published version is an editorial creation, assembling together various texts into a readable version that doesn't contradict itself.)
Development Hell: Tolkien began writing The Silmarillion during the First World War and it was published only in 1977, over sixty years after its first conception.
Saved from Development Hell: J.R.R.Tolkien worked on it from WWI to his death - over fifty years! - and it was published posthumously by his son Christopher in 1977. Most Tolkien fans agree it was definitely worth it.