Remember, Go was developed at Google - jokingly, while waiting for stuff to compile. They deal with tens of millions of lines of C++ written by thousands of engineers with varying skill levels and career paths. The advancedness of C++ did not reduce the compile times or readability of the code. At those scales you can't rely on being familiar with a particular section of code; you need to be able to drop in anywhere and know what's going on, without having to learn which subset of the advanced language they used for that particular feature.

Go is not advanced by design.