It was something not in the library because it wasn't in their sphere of consideration. When that expanded, due to feedback from the outside world, they respond

It was something not in the library because it wasn't in their sphere of consideration. When that expanded, due to feedback from the outside world, they responded in an impressive way. And that's just an example that was intended to illustrative. You'll just have to take my word for it that my experience of the Go ecosystem, tools, and standard library has been more solid than the various other things I've used over the years (python, C# + unity, c++, fucking maven, boost...). If I'm missing out on something even better, let me know. ;-)