The opposite side of that coin is that other programming languages do already exist.

Any new language is already playing catch-up to reach the state of the art. Go is 10 years old and in those 10 years has made astonishingly little progress at implementing basic features such as error handling, because the designers cannot escape their bubble.

The most sensible thing to do is to kill Go, not to improve it. The root problem is not the lack of this or that feature, but the bizarre beliefs of the people running the project.