I don't disagree with your point, but I have to ask: How do you design a site like SO that is simultaneously valuable for both beginners and experts?
SO is regulated because it means the content that is there is quality. Getting rid of stuff that doesn't work on SO makes it a better resource. Trying to shove that stuff back in would be terrible.
By all means, go set up that 'SO for newb questions', and when it's full of ananswered questions (because all the answerers get fed up trying to decode incomprehensible questions and feeding the help vampires), and content no one wants, maybe you'll get it.
Beyond all that, it's better for those asking too. Getting a short answer out of context isn't what those people need. They need proper, in-depth tutorials.