How young people are represented betrays a great deal about what is increasingly new about the economic, social, cultural and political constitution of American society and its growing disinvestment in young people, the social state and democracy itself.
The complaints I've had is that GitHub as a development platform - making commits, pull requests, keeping track of issues etc - doesn't work very well at all. It's not even close, not for something like the kernel. It's much too limited.