First of all: I agree. There are many things in Go that feel like a hack. For example, it is common (and idiomatic) to use a map with empty values when you want to use a set (unordered and unique values), because the map's keys are a set. I personally dislike this, and some aspects of Go are like this.

However this blog post is about how good core language design leads to unplanned patterns that are useful, like HandlerFunc and the private interface hack.