like Chris said in the article, it is difficult for GC languages to interop with C/C++ codebase.

in addition, if your system requires precise control over when and when not to use CPU, like resource-intensive gaming, browsers, OS, then GC may not be a good choice.

lastly, if you are using GPU via graphics API, I do not know any API that can garbage collect GPU memory but RC can naturally extend memory cleanup code to cleanup GPU memory as well quite easily.