But unlike traditional namespace, that you automatically got alias to things inside the same namespace. The npm's namespace is basically just a preserved prefi

But unlike traditional namespace, that you automatically got alias to things inside the same namespace. The npm's namespace is basically just a preserved prefix, mention scoped package inside another scoped package still requires you to write full name (scope + package) or it didn't work. I don't really see a reason that you can't implement it in a flat name package manager? Something like "you can't publish a package named as 'USERNAME_private_WHATEVER' unless you are USERNAME"