The constant thrash caused by the lack of a standard package management tool—even a de facto standard. Just look at the various package managers that have come and gone over the years:

1. https://github.com/tools/godep

2. https://github.com/kardianos/govendor

3. https://github.com/robfig/glock

4. https://github.com/rogpeppe/govers

5. https://github.com/Masterminds/glide

6. https://github.com/golang/dep

I'm sure I'm forgetting a few. And just when it seemed the Go team might be ready to standardize around Dep (6), they threw this wrench in the works.

I'm of two minds about vgo. I think it has some interesting ideas, but Dep works today, is widely adopted, and has nearly all the features you'd expect from a modern package manager.