I think that a lot of confusion has been caused by Go using the term "systems language," because (as I understand it) Go doesn't mean it in the same way that C++ and D do. The Go folks seem to be thinking systems in the sense of large networks of computers and the like (the kind of stuff that Google typically does), whereas the C++ and D folks are thinking systems in terms of stuff like operating systems. What Go is trying to do does not necessarily require low-level primitives (though it can benefit from them), whereas what C++ and D are trying to do does require such primitives.