Fast compilers with generics wasn't rocket science.
Of course the language is for dumb people, Rob Pike even said it officially, poor souls that apparently cannot master better tools, even though they are able to work around Google's stupid hiring practices.
His comment about making it easy for junior engineers was about pragmatic software engineering and being able to deliver product at scale.
There's plenty of far more advanced programming languages, e.g., Lisp, OCaml, Haskell, and even C++ as far as power of the language. But only one of those has gone mainstream and it was the C++ compilation time that inspired Go and Rust was also trying to be a better way to code within that paradigm.
It's a matter of taste, and while hating being forced to use a language you don't like to use is one thing, hating the language itself is silly -- it's like hating roses because you like orchids.
And if you think the original Go team was composed of dumb people you are also mistaken. They built a language they wanted to use, which I'd posit is a signal of "worthiness". Many people (including myself) enjoy using the language and it's created a lot of value in the software ecosystem.
They didn't know how to do it "correctly" -- it took outside help from Philip Wadler (who helped with Generics in Java) to make it work acceptably.
Of course the core team were a big bunch of dumb old stupidheads and they made a dumb language for dumb people, so you win, you're smarter than them.