author here; It's needed by `go install` to provide pre-compiled packages, which will then speedup the compilation of your applications down to 10sec. But you can also use the STUB setting, before running the setup and then use the binding with only 1gb ram as well. (the necessary c++ code will be compiled later with qtdeploy)

edit: can't comment any further currently, I will try to answer everything once I'm unblocked.