@edgarblythe,
The idea that the Universe had an absolute beginning was always appalling to Philosophers. Also this is old news there are plenty of models for a cyclic Universe from Multiverse 11 dimension superstring, to a succession of Big Bangs and Big Crunches (out of favour atm) To the old steady state, to Roger Pensrose more recently known Conformal Cyclic Cosmology model in which a Universe is preceded and succeeded by another Universe out of quantum fluctuations after an Aeon...
And even the old model of Einstein was based on the idea Time is a sort of phenomenal illusion which in turn is the same to say the whole thing existed all the time as a rock. So in good measure "beginning" is just a different way to say finite in size...
In sum Edgar the idea of beginning is a figure of speech and a deficiency of our primitive use of conceptual language that derives directly from our Evolutionary process and needs within "languaging".
Post Scriptum - I rather think of
Information Completeness, instead of thinking on a beginning, and by completeness I refer to a Fractal pattern of all possible states or configurations a Set of Universes can have without repeating another previous Universe. And that would be the Informational size of the Metaverse if you will. The maximum amount of phenomena or Qualia possible.