One's understanding that the Sons of God in Gen 6 are angels ("Bene Elohim" or, in Hebrew, בני האלהים was used exclusive by the writers of the OT to mean angels) introduces the stratagem of Satan to pollute the bloodline of man and thereby preclude God's plan to introduce Jesus as a human product of a man and a woman.
That's the reason for the Flood and the selection of Noah (Noah's being still genetically unpolluted).
Anyway, you are probably already aware of all this, but, in case you aren't, it is one of the most exciting controversies in the Bible today.
I don't think there is much controversy over whether or not the Book of Enoch is or ought to be included in the canon, but there is a massive amount of controversy over whether or not it ought to be studied as authoritative ancient Hebrew Lore that sheds light over the truth about Fallen Angels.
This is what the Book of Jude does. It reminds the readers of the New Testament about the Book of Enoch (and quotes the Book of Enoch about the Fallen Angels) as a preface for the next and most mysterious Book of the New Testament...the Apocalypse of John (Book of Revelation).
Very exciting stuff.
When I first read Enoch a lot of it gave me the impression of being written by someone with a fairly modern take on prophecy trying to make it sound like Old Testement writing...if that makes any sense.
It is exciting. I have read a little bit on this question but I’ll have to try to look into it all more.