Not really, not in this case. The author of the article should take some time to learn idiomatic Go. "[...] I can use packages as metaphore for classes" is a b

Not really, not in this case. The author of the article should take some time to learn idiomatic Go. "[...] I can use packages as metaphore for classes" is a big red-flag that one doesn't have the fundamentals. When one writes Go, writes in Go. Not in Ruby, not in Lisp, not in Haskell. In Go.