Async might be a wrong abstraction for high-level programming: green threads/goroutines are so much easier to use. On the other hand, writing a state machine f

Async might be a wrong abstraction for high-level programming: green threads/goroutines are so much easier to use. On the other hand, writing a state machine for handling concurrent events/transitions is literally async done manually. libuv, any high-performance network server, UI events handling are all like that. I agree that doing low-level async right is difficult and might be an impractically long process.