Does anyone remember "Inside Macintosh," the manuals Apple published back in the classic Mac OS days? I have many of those books, covering everything from how the hardware handles drawing to the screen, up through memory management, files, networking, etc. They're examples of some of the best technical documentation I've ever encountered. It's too bad they don't prioritize that anymore. :(
S'not the same to read about it. If you're interested in documentation writing I recommend looking for some of Apple's older stuff on archive.org to see what it's like. I don't see much documentation written in their kind-of extended style these days... A lot of documentation seems to be either terse or tutorial-y, there's not much that tries to focus on the concepts relating to / the purpose of a given feature.
