Being elaborate doesn't mean that you are extremely lengthy does it? I'm not saying that it is as long as the epic, but it is still rather elaborate in explanation and detail. The size of the ark, the reason for why God was angry, the story doesn't just stop after the water recedes but continues to the promise and offering of sacrifices as well. I'm sure the following epics that incorporate the flood are even more "elaborate" but that does not mean that the story of the Flood is not also rather Elaborate. Probably more so than when it was just an oral tradition.
You should reread my answer.
I gave examples of elaboration that are absent in Genesis. After studying the progression of literature over the 800 years from 2400 to 1600 BC, the differences begin to stand out like a giant purple gorilla.
(And the reasons have nothing to do with what people want to write. They're related to grammatology and the tools used to write.)
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