[Brian]

Mozilla's degree of transparency works well for a project that's built on co-ordinated volunteer efforts, but when we're making plans for what needs to happen in the best interests of our applications, we don't want to have to take "Will a panic erupt on the forums" into account every time we make a change...

Our development database is also laced with information that we can't publicly disclose, so we'd either have to maintain two systems in parallel, or just keep the whole thing private and not have to worry about it at all. :-)