plus Go has now acquired a culture of heavily optimising their code to "not allocate", so allocation is less of an issue for them than runtimes like Java.
It's not that those libraries "not allocate" but they work with stack allocation / provided buffers. You can reuse the provided buffers / output objects ... But a lot of req/resp code doesn't so it's just pushing the cost higher up the stack (app vs libraries). Which it self is a good argument for "transactional" GC.
