In my opinion its more like: Go comes with a package-management/install system onboard, and for every 'go install', there's a full copy of working sources which someone, some day, might consider reading and contributing to ..

So I think, at least as a go newbie, that its quite handy that pretty much every tool I might be interested in - because it was written in Go - comes with full sources onboard as a basic, starting-gate, expectation. At least, I am quite happy to be learning Go this way ..