> almost seems like Go is trying to become some sort of C# or Java Frankenstein

The original Go team was trying to avoid this:

"Java, JavaScript (ECMAScript), Typescript, C#, C++, Hack (PHP), and more [...] actively borrow features from one another. They are converging into a single huge language." [0]

That team has since moved on, and now Go has begun to join that convergence.

The problem is that most programmers seem to want to write Java, more-or-less. New, simpler languages come along, but once they get popular, the pressure is on to turn them into Java-likes. It happened to Python and now it’s happening to Go. It takes a strong will for language maintainers to say “no”, and their language will suffer in popularity as a result - see, for example, Ruby.

[0] https://go.dev/talks/2015/simplicity-is-complicated.slide#5