Terry,
An interesting review which raises some interesting matters. Some of them though, I am not sure that I follow you on.
For one, when you refer to two Biblical accounts of the flood, what is the second one? Is it in Genesis, another book of the Bible or something like Enoch?
Watchers are not very well spelled out in the Bible. And they bring us to Enoch again.
Are we to assume that things not explicitly said in the Bible are in other books such as Enoch? How you deal with that is one matter, but there is also the larger matter of how people reading the Bible should deal with this generally. If there is a Biblical canon, then what are we to make of books that did not make the cut, yet are called upon to make sense of the ones that did?
When someone said, let's go see "Noah", I did go along, but it was not because it was atop of my "do list". It did strike me as a strange film, and I did not find much kinship with it. But I suppose, like a long list of plays, novels and movies inspired by brief classical outlines, there was much room for an author or playwright to allow examination of new ideas derived from the set piece.
Still, I am reminded of a local anecdote, related to the people who step into that breech created by speculation about UFOs. If I recall, the guy was a MUFON member and had spoke a lot about what a UFO if it should land might contain. When the film "Close Encounters" came out, he was asked his view of that film. What did he make of it?
"Well, actually, I don't think it was realistic..." Under the circumstances of conjecture, satisfaction could not be guaranteed.