A billion times yes. As a developer, I'm going to curate my documentation in the same repo as my source code. And I want my contributors to file documentation

A billion times yes. As a developer, I'm going to curate my documentation in the same repo as my source code. And I want my contributors to file documentation PR's to the canonical repo. I see the whole SO Docs thing a transparent attempt to monetize advertising revenue by thieving attention from the projects they purport to help. Time spent improving the documentation on SO is time not spent improving the canonical documentation curated by the project maintainers.