I figure that some of this is due to a lack of leadership structure.
The leadership page is still a draft, mentions an advisory and technical
committee, but has yet to add members or even describe how members are
chosen.
Some of it is also that the core stuff is mostly Red Hat maintainers. But
that doesn't mean you cant do testing and fix bugs. Often upstream is
the better place to fix your bug anyway (so all gnome users get it
promptly not just RH ones for example)
Fedora.us also needs folks to test/QA the current contributed non core
stuff so people can get started. So if there is an app you use and its
not critical its perfectly 100% working every day then grab the testing ones
and see how they do