GC is shit.

Why can't everyone just use C++ and C and throw away all GC-languages.

It's simple, just write all your applications in C++ and all your OSs in C and everything will be fast and beautiful.

Is there any place where using GC would actually benefit in any way? I think not.

Garbage collection is bullshit. The Universe doesn't use garbage collection, it uses pre-allocation. Biology doesn't use garbage collection, it uses cellular respiration and transcription. Real programmers don't use garbage collection either.