It's really hard to make a case for GC and systems (constrained latency, memory, embedded, realtime) being compatible at all. I've had some success using my own

It's really hard to make a case for GC and systems (constrained latency, memory, embedded, realtime) being compatible at all. I've had some success using my own allocation pools just to avoid latency slowdowns in critical loops—functionally disabling GC for that call tree. And I know that you can disable the GC in D, but it's hard coming up with a good use case for the language that wouldn't be fit better with another smaller, tailored language.