My personal problem with Go is that it doesn’t fit in any niche.
If you want language optimized for productivity with a lot of high-level features, use Python. If you want maximum performance and low-level control, use C++ (or C, or Rust). If you need relatively high performance but can tolerate it not being 100% in exchange for nice things like GC, use Java. Where does Go fit?
If we're being serious here, I'm pretty sure Go is specifically for very very large orgs and almost no-one else. Go optimises for low GC pause time, fast compile times and in-your-face concurrency at the expense of almost everything else. The fact that CSP is formalised and well studied, and the lang itself is sufficiently C-like and stripped down makes it amenable to large scale static analysis as well.
