Agreed. But it is an example of the sort of book that we don't get a chance to see too often these days — a book built from a combination of knowledge and imagination, driving down and through territory most everyone else avoids or doesn't even notice. For the purpose of pushing the boundaries of thought, and charting unknown territory, it truly doesn't matter when such people turn out to be mistaken or wrong; what matters is that they've opened ground for others to cover and investigate. Our siloed, narrow-to-a-mathematical-point graduate education system does everything it can to keep people from building such thought edifices, and from true, organic cross-discipline/category work. We need more like Jaynes.
I would rather read Jaynes for the breadth of his knowledge and novel ideas than one hundred “scientists identify the location of bad taste” fMRI papers.