Actually the series is mostly about “where we are, and how we got here,” and so it’s more like the history is the content and the cognitive science is the secondary content. So it’s not “why is half of this history?” and more “why did he tack on another 25 lectures afterwards?”
I agree. I also think that part is the better part of the series, and I can see myself recommending to people to watch just the first part, but not just the second. Though the second part explores some important concepts (like relevance realization) I think there’s a lot of room for improvement on the delivery, where I think the first part is quite well done.
I think the two things that most bothered me in the second part were his overuse of complicated language, and his overuse of caveats (I get why he makes them, but it breaks the flow and makes it so much harder to follow, especially together with all the complicated language)