Reality is complex by definition. Just because golang pretends it doesn't exist doesn't make it so. Secondly, the JVM GCs allow selecting the best GC for the job, whether it be throughput, very large heaps (mutli-GB to TB sized, which golang fails at), or low latency (ZGC and Shenandoah). Furthermore, the new low latency JVM GCs have very few knobs to set (2-3 last time I checked).