Considering there are existing and official dependency management tools for Go, the Go team doesn't need to be convinced that versioning is a good idea. This article is a discussion about mainlining a dependency management system as part of the existing `go` tool.

They're similarly aware that generics are a desirable thing to have, but haven't determined the ideal way to implement generics into the language.

Did you actually read the article? It is clear from the background and history sections that the need for versioning was apparent from early on.