Basically complete disregard for the history of programming languages and learnt lessons.

Go fits well close to Oberon released in 1987, or Limbo in 1995, when exceptions and generics were still esoteric features.

Instead they had to reach out to Phil Wadler to help them, as he did previously with Java almost a decade earlier, panic/recover is clunky way to do exceptions, instead of doing enumerations like Pascal in 1976, it needs a a iota/const code pattern, hardcoded urls for source repos, if err all over the place like last century programming, many errors are plain strings, ah and nil interfaces what a great gotcha.