Furthermore, the kinds of argumements that Diamond would provide weren't actually "tested" per say. Social Sciences are a "Science" (albeit flawed in some shape or form), but are dependent on validating a hypothesis in a reproducible manner as well, hence why economics has basically become applied math since the 50s (and similar changes in other fields like Sociology, Linguistics, Polticial Science, and Anthro as well)
There isn't much difference between grifters like Perun or Zeihan and Jared Diamond.
Also, Jared Diamond doesn't have a background in Economics or Political Science - he is an Ecologist/Environmental Scientist (and one of the best ones at that), and as such reading GGS induces Dunning-Kruger for those with a background in Comparitive Politics.
Do you just go for the market salary and treat the equity as a minor plus?