It has all the things science fiction does (attempts to predict the future, large scale social dynamics scenarios, etc), plus a hint of what science used to look like in the public perception at that time.
It's kind of provocative. That line of thinking implies science fiction authors need to be more science and less fantasy (exactly what Asimov himself did by starting to more textbooks and less characters).
Of course it will never exist.
Marx however never tried to make exact scientific predictions in the lines of psychohistory. He made behavioral philosophical predictions (so did Adam Smith and many others, and all sorts of people of various political alignments still do).
It's a nitpick. I definitely don't want to discuss semantics related to "isms".
Did Asimov flirted with communist ideas? I definitely think he portrayed similar ideas in Foundation, but I cannot say he endorsed them. Take the idea of individuals being able to shape the history (as opposed to the state being the vehicle for change). That is definitely not communist thinking.
Now instead of the Foundation series' Hari Seldon, we have the WEF's Yuval Noah Harari, who is set up as some kind of scientific oracle for our past and future.
