If the story of Noah is true....than that means that destiny is true. Everything is predetermined. Nothing you do or say can change your fate in the eyes of God. Reasoning?
BEFORE Noah started to preach, God had already told him the dimensions of the Ark. Noah then preached for decades while building the Ark. If God had already prescribed the dimensions of the Ark PRIOR to the start of Noah's preaching that would mean that God knew that no one would respond and Noah's preaching was in vain PRIOR to it commencing! If that is the case, then NOTHING....ABSOLUTELY NOTHING that you do can amount for much...you are either destinded to live or destined to die.
My take on all this, it is a Hebrew legend to further distinguish the Hebrew nation as chosen by God. Nothing more. Nothing less.
SOP