I agree that dependency management and GOPATH are two annoyances that need to go away. GOPATH in particular is a constant pain when you work across multiple machines like I do, and feels like a mandated anachronism/catechism (your workspace must be like we want it to, and we don’t care about your own methods).
On the other hand, lack of proper vendoring, version pinning and getting random versions of libraries off GitHub makes a lot of people anxious about long-term reproducibility.
Like a peer of mine once said, “maven is forever. They don’t call things ‘artifacts’ for nothing, I can even do archeology in my dependencies”.