alt Hacker NewsGo users can only insert assembly wrapped in a function call. That might be safety related, I am not entirely sure.
(Well technically there is a way to inject assembly without the function call overhead. That's what https://pkg.go.dev/runtime/internal/atomic is doing. But you will need to modify the runtime and compiler toolchain for it.)
If you look the docs, they expect the developer to add specific information and use the registers in a specific way, otherwise Go will face runtime issues.
Whereas when you go over CGO, you get a marshaling layer similar to how JNI, P/Invoke work, that take care of those issues.