Another use case aside from the typical "high perf" ones: if you're building a cross-platform library with bindings in various language (eg. Swift bindings, Kotlin, C#, etc.), I'd imagine you'd benefit in the long run from having manual memory management and a thin runtime that doesn't clash with the host runtime. But personally I'd choose C/C++ for this, for the sake of existing support in writing bindings and C interoperability.