Good point, but the devil lies in the details. How should the timers behave? Is the clock monotonic? Are tasks spawned on the same thread? Different platforms and executors have different opinions. Maybe it's still possible and just a lot of work?

> Maybe it's still possible and just a lot of work?

Yeah, I think that's the current status. I believe it was for a long time (and possibly still is) blocked on language improvements to async traits (which didn't exist at all until relatively recently and still don't support dyn trait).