I seriously wonder about this myself, A-G. Is the theory a kind of "Procrustean bed" into which evidence is "forced" to fit? Further, parts of it seem to have a mythical quality -- e.g., the Common Ancestor.
People will scream that I use the word "myth" in connection with anything scientific. But myth is actually a technical term in philosophy, and some myths are "true" -- or as close to "true" as one can get without direct evidence. And it is the lack of direct evidence that explains how myths arise. Myths are conjectural logoi, or "stories" that explain, or give an rational, reasonable account of broad sectors of reality, or even of total reality (e.g., cosmologies of every description). And as Plato indicated by his term, aletheia logos, some myths are "likely stories." That is to say, there is a high probability that such myths are actually true.
If we are to have a history of science, we absolutely would have to include the great Greeks, including the pre-Socratics.... FWIW
Thank you so much for your penetrating analysis!
Indeed, a proper redefinition of "science" would include the wisdom of the Greeks and myths which are likely stories. Theories from all the historical sciences are myths because they are theories of continuums based on quantizations.