For an opposite example, consider async/await in C# - you're not restricted to .NET when using it; it also supports e.g. the native async OS APIs in WinRT (which are callback-based on ABI level: https://docs.microsoft.com/en-us/uwp/api/windows.foundation....). Ditto for co_await in C++20.

Go's approach leads to an insular ecosystem that tends to reimplement everything, because that's the only way to get this transparent async throughout.