"Package manager"-like behaviour like this is evil. Importing software/code at runtime from the internet (like Apt, Go, Pacman, Pip, NPM, etc.) is the equivalent of those dreadful online stub installer packages, and it's impressive it's as trusted a mechanism as it is.
Leave the Go code or Linux distro to link-rot for a couple decades and all imports like this will be dead or serving malware, leaving the software unusable.
Leave the Go code or Linux distro to link-rot for a couple decades and all imports like this will be dead or serving malware, leaving the software unusable.