[topkai22]

I suspect the increasing dominance of open source and free (as in beer) software for the last decade is at play, too.

Companies selling development software/libraries can pay for teams of content developers and evangelists. They also would serve as single source of truth for the canonical way of doing things. And they would give away the content in order to get license sales

The rise of the free (as in beer) software doesn’t have the same incentives, culturally or economically. The documentation of the better libraries is often great and better then the what I remember from closed source vendors in the past, but it normally stops at the boundary of the library. It’s rare to see teams of evangelists/content on OSS projects directly creating integration level content (although some of the bigger projects see that).