You forgot URLs as import namespaces. It makes it literally impossible to swap one library for another (a rename or fork). A simple example that had caused ton

You forgot URLs as import namespaces. It makes it literally impossible to swap one library for another (a rename or fork). A simple example that had caused tons of grief and had probably wasted lots of man-hours is when github.com/Sirupsen/logrus became github.com/sirupsen/logrus. Vendoring sort of works for simpler "I need a patched version of this" cases, but is not a real solution.