It's competitive in pretty forgiving benchmarks. And LLVM is way more advanced than Go's compiler, but not OpenJDK's. I'm not saying you have to prefer Java to Go, but its throughput is better. As to the stack-allocation claim, young generations might be hundreds of MBs; that might correspond to the stacks of 100K goroutines on some server workloads, but not of a few threads.

So I'm not saying you must prefer Java to Go (even though GC tuning is a thing of the past as of JDK 15 or 16), or that Go's performance isn't adequate for many reasonable workloads, only that 1. a flatter object landscape might still not match Java's memory management performance without sophisticated GCs, and 2. I wouldn't extrapolate from Go to Julia, as they are languages targeting very different workloads. E.g. Julia might well prefer higher throughput over lower latency, and Go's GC's throughput is not great.