The best thing about using only ASCII for the main syntax is that everyone can type it with their keyboard. I think the recent fad of supporting Unicode identifiers is misguided. Of course, Unicode should be permitted in string literals, but not in the code itself. *Also I don't think Go is better than modern C++, though it might be better than C++99 which was the main standard when the article was written.
If you don't do math it's difficult to understand, but try writing without the alphabet and expressing the same concepts. Possible but clunky