@marketer - Too true. Wynn and I didn't like that either. I think it was just that he wasn't personally aware of that feature. I could ping them and get a more clear answer via email for you.
Go's overarching principle is "to reduce the amount of typing" and "reduce clutter and complexity", but if you switch from something like python or ruby to go, you'll quickly notice there's a lot more typing and complexity for programs. Especially when it comes to stuff like type declarations and error handling.