I don't get your distinction. Async/await is just a syntax sugar on top of standard syscalls and design patterns, so of course it's possible to reimplement it w

I don't get your distinction. Async/await is just a syntax sugar on top of standard syscalls and design patterns, so of course it's possible to reimplement it without the syntax sugar. But when you have a standard futures API and a run-time, you don't have to reinvent it yourself, plus you get a standard interface for composing tasks, instead of each project and library handling completion, cancellation, and timeouts in its own way.