I tend to conflate higher expressiveness with being "clever" until you're really proficient in the language. I think Go's main value prop is that it performs well with very little ramp up time compared to languages with more powerful features.
If you have a team of people who are really strong with something like OCaml or Scala, they'll be amazingly productive. But if you have a rotating team of engineers with varying backgrounds, it's hard to beat Go when you're talking about time-to-productivity.