Maybe they're too busy to write about it? ;)

I think your point about devs/designers/PMs/etc. having a unique culture is spot on. It's a field that tends to attract a lot of high achievers, and a field that people tend to tie themselves a lot to their work. That was one of my main problems - over a few years, I started to define myself based on the work I was doing. It's taken me a lot longer to dig out of it than I thought.