A mediocre language is not the same as a language appropriate for developers of mediocre skills. Go could have been made a better language [0] in many ways that would have actually made it easier than it is right now, by avoiding some of the footguns built into the language. This also wouldn't have made the language more prone to being used in a complex manner by metaprogramming enthusiasts and the like. Better often means simpler, not more complex.

[0]: Not that it's not already decent.