People really need to stop acting like a garbage collector is some sort of cosmic horror that automatically takes you back to 1980s performance or something. The cases where they are unsuitable are a minority, and a rather small one at that. If you happen to live in that minority, great, but it'd be helpful if those of you in that minority would speak as if you are in the small minority and not propagate the crazy idea that garbage collection comes with massive "performance penalties" unconditionally. They come with conditions, and rather tight conditions nowadays.
In a system programming language?
I have been working in GC languages for the last 25 years. The GC has been a performance problem for me... once. The modal experience for developers is probably zero. Once or twice is not that uncommon. But you shouldn't bend your entire implementation stack choice over "once or twice a career" outcomes.
This is not the only experience for developers, and there are those whose careers are concentrated in the places where it matters... databases, 100%-utilization network code, hardware drivers. But for 99% of the programs out there, whatever language they are implemented in, GC is not an important performance consideration. For the vast bulk of those programs, there is a much larger performance consideration in it that could be turned up in 5 minutes with a profiler and nobody has even bothered to do that and squeeze out the accidentally quadratic code because even that doesn't matter to them, let alone GC delays.
This is the "system programmer's" equivalent of the web dev's "I need a web framework that can push 2,000,000 requests per second" and then choosing the framework that can push 2,001,000 rps over the one that can push 2,000,000 because fast... when the code they are actually writing for the work they are actually doing can barely push 100 rps. Even game engines nowadays have rather quite a lot of GC in them. Even in a system programming language, and even in a program that is going to experience a great deal of load, you are going to have to budget some non-trivial optimization time to your own code before GC is your biggest problem, because the odds that you wrote something slower than the GC without realizing it is pretty high.
Of course, but how many developers choose C _because_ it does not have a GC vs developers who choose C# but then work around it with manual memory management and unsafe pointers? ....... It's > 1000 to 1
There are even new languages like C3, Odin, Zig or Jai that have a No-GC-mindset in the design. So why you people insist that deliberately unsafe languages suddenly need a GC? There a other new languages WITH a GC in mind. Like Go. Or pick Rust - no GC but still memory safe. So what's the problem again? Just pick the language you think fits best for a project.