(We can do some stuff before this, but this is always a bit of a fight with the vendors, because they do not like it at all if we tell them what to do, especially clang folks)
C++ is something else. Heck, it's often far more bound to a Windows domain (and for a while Be/Haiku) than Unix itself by a huge stretch.
https://www.tuhs.org/Archive/Documentation/TechReports/USG_L...
Golang it's like Windows NT. C++ it's like Windows ME, it might have their cases on RT performance and multimedia because of having far less layers than NT, (and much better on single core), but it crumbles down fast and it was really easy to shoot yourself in the foot. Windows 2000 and XP killed it for the good.
Some day Golang would be performant enough (even with CSP) with multiple cores so all the 'performance' advanteges -suppossedly C++ brings- aren't needed at all.
Even C# can be as good as C++ today in tons of cases (AOT and emulators like Ryuyinx are not a bluff), even SBCL for Common Lisp too if you finetune the compiling options.
What I disagree with is the idea that C++ was developed completely independently of C (and Unix) - it originated at Bell Labs and was initially just an extension of C with classes. If you looked at the document I linked to, you would see that Bjarne Stroustrup thanks Dennis Ritchie in it for being a source of good ideas and useful problems. I don’t think I need to explain who Dennis Ritchie was for C and Unix.