I am aware that there are problems with the books, even some serious ones. But I find that hardly surprising from a book that references a 1000 other scholarly works. But the reason you can critique the book effectively is because he references where his claims originate from.

In the language of this essay [1], Graeber's work is legible, Harari's not at all.

[1] https://acesounderglass.com/2022/02/07/epistemic-legibility/