One of the unexpected benefits (to me at least) of the rise of archaeogenetics is it hammers yet another stake into the zombie corpse of Post-processual archaeology the bastard offspring of "New Archaeology". Without the scientific method archaeology is just the the making up and telling of tales. Great fun and illuminating of the human condition and all that, and of some value in pointing out the danger of subjective biases of the observer, but that is all it is.
To quote, and I only pick on this because it is an excellent exposition of the fears of the post-processual prehistorians:
By Jakkolwiek [GFDL or CC BY-SA 4.0-3.0-2.5-2.0-1.0], from Wikimedia Commons
Processual archaeology (formerly the New Archaeology)
Writing in 1987, the archaeologist Christopher Chippindale of Cambridge University spoke on the view of processualism at that time, putting it in the context of the 1960s, when he stated that:
The sharper students of the current generation reasonably regard the "New Archaeology" in its pristine form as a period piece, as strange an artefact of that remote era as the Paris évènements or Woodstock. They have some cause: the then-radical insistence that nothing valuable had been written in archaeology before 1960 matched the hippie belief that anyone over 30 was too ancient to be intelligent, and the optimism that anything could be recovered from the archaeological record if only you searched hard enough was the archaeological version of the hope that the Pentagon could be levitated if only enough people had sufficient faith.
Chippindale, Christopher. 1987. Review of "Processual Archaeology and the Radical Critique". Current Anthropology Volume 28, Number 4.
Post-processual archaeology, which is sometimes alternately referred to as the interpretative archaeologies
The post-processualists' approach to archaeology is diametrically opposed to that of the processualists. The processualists, as positivists, believed that the scientific method should and could apply to archaeological investigation, therefore allowing archaeologists to present objective statements about past societies based upon the evidence. Post-processual archaeology, however, questioned this stance, and instead emphasized that archaeology was subjective rather than objective, and that what truth could be ascertained from the archaeological record was often relative to the viewpoint of the archaeologist responsible for unearthing and presenting the data