Uh, Go is not a research project. It was written to be used, not to explore previous unexplored language features. Basically nothing in the language is new (or at least wasn't new to the creators), something that it is often criticized for.

Dropbox has stated that pretty much their entire backend is written in Go. Go is also (obviously) used in production at Google. Neither Dropbox or Google is screwing around. Once a project is run at Google or Dropbox scale, it is no longer a research project.

Go is very simple (many people say too simple) and writing a web app in it doesn't really require a very good understanding of the language. This is because very few of its more advanced features are really required for writing a normal web app. Because it isn't really a framework, it does require a good understanding of web development.

I think Haskell can be fairly described as a research project and definitely requires a good understanding.