Plan 9 is significantly more recent than Unix: Back when Unix was first invented, graphics existed but there were more kinds of graphics devices, and it wasn't entirely clear that vector graphics, for example, wouldn't become the way forward and deserve the majority of developer attention.
Not sure if you are still watching this thread, but here's my rant. I am the OP.
Positives
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The articles posted on your site are top notch. For eg: In the page I see now, I wanted a beginner article on the latest TypeScript buzz, it's there. The WebAPI and Rosyln were fun to read, so was the MVC with TDD and many more articles listed.
Negatives
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Someone has mentioned this in a comment here, and I do it again. Why don't we have a community section for Azure, Windows Apps and so on? I find information from the community much easier to understand and practical and makes up for the incomplete MVC and WebAPI documentation. The same goes for other technologies as well.