In addition to that, I thought I read a part earlier in the text, don't remember where, in which he said the WPA narratives had to be taken with suspicion because most (all?) of the interviewees would have been children under slavery and were being asked questions during the Depression when they most probably would have been destitute and would have thus colored their responses.
I also think I read, maybe somewhere else (one of the obits?), that he was one of the first historians to have mastered the WPA material.
I haven't really noticed much of a "Slavery wasn't ALL that bad" skew except in the parts comparing the material conditions (working hours, diet) of slave life in the South to other American slave societies, Eastern European serfs, workers during the Industrial Revolution, but, I admit, I still have 300+ pages to go.
Looking ahead, what, in your opinion, would be a good book to counterbalance this "Slavery wasn't all THAT bad" skew?