Interesting... by "binary source code" do you mean "binary" (executables)? Do you mean you see distributing binaries as a not-intended use case for .debs, and that they should all result in builds straight from source? Or am I misunderstanding what you're saying? Because I feel like the people who use Debian or Ubuntu (or Arch or Fedora or...) aren't really longing for the experience of building everything from source like Gentoo users might.