One could imagine that a group of anthropologists and scientists sent off to study a previously uncontacted Amazon tribe today might be bound by similar strictures [not to reproduce with natives]. But suppose some of them disagreed? Suppose some of them "went native"--as used to be said of colonialists in the days of the British Empire who allowed themselves to get too close to indigenous populations they interacted with.
Is that perhaps what happened to the troop of two hundred "Watchers" on Mount Hermon? Somewhere around 10,900 BC, did they break the commandments of their own culture and "go native" among the hunter-gatherers of the Near East? And were the first chance encounters with the fragments of a giant comet a century later in 10,800 BC--encounters that devastated the world--somehow blamed upon their moral lapse?

Regardless of the fact that the express purpose of God's Deluge is to kill off most of mankind--apart, of course, from Noah and his descendants--there is talk of the need to: 'heal the earth which the angels have corrupted ... that all the children of men may not perish through all the secret things which the Watchers have disclosed and have taught their sons.'
[...]
From such admonishments we may reasonably deduce a number of things about the Watchers, most particularly that they must be about the right size and shape, and equipped, moreover, with the necessary organs and impulses to want, to have and to enjoy sex with human women. To me, the obvious conclusion from this is that the Watchers are in fact human, or at any rate extremely closely related at the genetic level to anatomically modern human beings--close enough, indeed, to make human women pregnant and to have "children of fornication" with them. These offspring are not sickly as one might expect from an even slightly mismatched genetic makeup. On the contrary, they thrive so vigorously that Enoch, or the "good" angels speaking through him, want not only to destroy the Watchers but also to 'destroy the children of the Watchers.'
[...]
So now further clarity begins to emerge. A group of bad angels, "Watchers of the heaven," have come to earth--"descended," specifically, on Mount Hermon in Lebanon--transferred some technology, mated with human females, and produced offspring who are in some way gigantic and are called Nephilim.

Figurines of Apkallus were buried in boxes in the foundation deposits in Mesopotamian buildings in order to avert evil ... The term massare, Watchers, is used of these sets. Likewise the Apkallus were said to have taught antediluvian sciences to humanity and so, too, were the Watchers. As one scholar concludes, however: 'The Jewish authors often inverted the Mesopotamian intellectual traditions with the intention of showing the superiority of their own cultural foundations. [Thus] ... the antediluvian sages, the Mesopotamian Apkallus, were demonised as the 'sons of God' and ... appear as the Watchers ... illegitimate teachers of humankind before the flood.

Cainan (sometimes the name is spelled Kainam) was the son of Arpachsad: "And the son grew, and his father taught him writing, and he went to seek for himself a place where he might seize for himself a city. And he found a writing, which former generations had carved on the rock, and he read what was thereon, and he transcribed it and sinned owing to it, for it contained the teaching of the Watchers in accordance with which they used to observe the omens of the sun, moon and stars in all the signs of heaven." Here, then, is the origin of the star worship of the Sabians traced all the way back to the mysterious Watchers--whoever they were, whatever they are--who settled in the Near East in antediluvian times, taught our ancestors forbidden knowledge, broke some fundamental commandment by mating with human women and, as a result, were remembered as being responsbile for the great global cataclysm of the Deluge.

In modern times, Australia was the sole continent still inhabited only by hunter-gatherers... Native Australia had no farmers or herders, no writing, no metal tools, and no political organization beyond the level of the tribe or band.

I'm not an academic; I'm not an archaeologist. I'm a writer, communicating ideas to the public. There is a model of how the past is, and a lot of academic archaeology is about refining the model. It's not about changing the model radically. I'm not aware of any current which is about radically changing the model. It's just me, really.