Earlier quoted context omitted.
And Go: https://github.com/ericlagergren/go-coreutils Does he really not know this or is he ignoring them to make a point?
It uses remote dependencies. First compilation in a single-run environment will be very slow, there won't be second compilation. Go compiler is fast when you add the `-i` flag, without it it takes a couple of seconds to compile a few hundred lines, a few more minutes when you have to `go get` packages. Now, github goes down, your build is broken for that time.
Not sure what the "it" is in your first sentence, but allow me to address the rest of your points. "First compilation ... will be very slow": the go compiler is in fact quite fast, orders of magnitude faster than C++ or rust compilers. The fact that there's a noticeable pause when you want to compile thousands of files does not mean that its slow. "There won't be a second compilation": not for each top level tool, but there certainly could be shared packages that don't need to be recompiled. "Go compiler is fast when you add the `-i` flag", ok, do that then. "Now, github goes down, your build is broken": you only need to depend on external github references if you want always to build against the latest version of your referenced code. I can't imagine anyone interested in stability wants this. There are lots of options for vendoring your dependencies in tree.