I disagree, I think fundamentally, package management (w.r.t source) is about controlling what versions of which packages are built into your binary. Ultimatel

I disagree, I think fundamentally, package management (w.r.t source) is about controlling what versions of which packages are built into your binary. Ultimately its basically a set of external dependencies that you want to version-control and occasionally update. I see no fundamental difference to what version-control is, its just not a feature built into most/any.