It’s amazing how much incorrect crap just gets passed around because people just accept it at face value.
Egypt for example only had non destructive flood myths yet they get lumped into the every culture has a flood myth trope. It’s true only in the way basically every culture also has a myth involving rain, dirt, trees, wild animals, death etc. The content of these myths generally have little in common beyond similarly broad categories outside of cultures in some form of contact with each other.