It should've been asked before, but I couldn't find it.
Another example, some real-life questions.
- "How to use Facebook account to login via OpenID" - Stack Overflow site (there're dozens of such questions)
- "Why Facebook won't become OpenID provider" - webapps site strictly (offtopic on Stack Overflow)
Isn't the difference so subtle, that it practically doesn't exist?
Same for web design. If you want to align two divs one next to another horizontally, would you go to doctype.com? But I see lots of such questions on Stack Overflow.
In short, why can't tags and 'expert badges' indicate the difference between a Bash expert and a Perl expert? It seems much smaller than the difference between many topics inside the main Stack Overflow site.
There's also a gamedev.stackexchange.com, where nearly all questions are about programming (C++, OpenGL, etc.). Maybe more.