@Discipulus I mostly agree with your comments - but will say that I have found specific references to my ancestors in books and diaries so it's not always true that one doesn't. In general though, for me these works provide the framing device for my family story. I don't know, for instance, what my ancestor who was confined in the Elmira prison camp personally experienced. I have a few clues based on his records. So I don't write "JB was hungry and cold." I write "Many of the prisoners were hungry and cold. Diarist Anthony Kiely said..."
Is that genealogy? Technically, I suppose not. But as
@Michael C. Hardy said, it depends on the project. When I enter data into my family tree, I only put in verified facts. When I work on a family story (the current one is my third) I add historical information for context. To say, for instance "David moved to Chicago in 1873 and died there of typhoid fever three years later" is pretty boring. But when you add information about why people moved to a rapidly growing city and why so many people died of typhoid fever in a city built on a swamp and how David's house was only one block from the edge of the great Chicago fire - those facts come alive.
Do we need to quibble over whether counting 'newspapers' as a potential source means one type of source as opposed to dozens or hundreds because of the many different papers? Not really. The point, I think, is to never feel you've exhausted your resources when you get to the end of a list of potential sites. There's always something more out there - provided you have the time and desire to find it.
We are in agreement. I thought I said the same as you, I suppose just not as articulately. HOWEVER. . . .
The subject, if I might bring the discussion back around to it, is the log I posted. To say "good start, but hundreds of other sources" can be taken as an insult. In genealogy, there are
not "hundreds" of other sources that can tell you
facts about your individual ancestor! All genealogists wish there were!!! That is what the author of the log was listing -- the list of fundamental locations for facts about your individual ancestors.
Would the author of the log recommend reading relevant history publications to learn more? Absolutely. But in genealogy, those are almost never "sources" that give you
facts about your individual ancestor.
What if I turn my genealogy into a narrative as you are doing? That is different. Then, as you said above, you are including what you learned from the history books, and they become "sources"
to your narrative, but not to the genealogy. The genealogy is only interested in the facts about the individual.
I am sure to most reading this, I am splitting hairs. But as a genealogist, I have to deal with this constantly, almost daily. I work to keep my product within
the Genealogical Proof Standard (GPS) where most hobbyists don't. What is a "source" for genealogy? A history book that describes what life was like for the citizens where your ancestor lived is not a source. It speaks in generalities, not what is specific to that individual. But it would be a source for a narrative were you to convert your genealogy into one.
I am repeating myself. Please forgive me.

I have exhausted this.
I hope we can all agree that the log is a good start to a thorough and organized approach to researching your ACW ancestor. Exhaustive? Of course not. I don't think the author of the log would agree to that either.