My reply was at least partially facetious as this wasn't my first exposure to Go. If you like the simplicity of Go's type system I can't argue with that, but I do think your article demonstrates the way that simplicity at the language level pushes complexity into the users code. Pick any modern statically typed language and this whole post will boil down to something like:

  data Genre = Adventure
             | Comic
             | Crime
             | ...
             deriving (Show)