[ppcsf]

I'm not sure that "the areas of the complexity spectrum where the problems are too simple for async/await" overlaps with "the areas of the complexity spectrum that async/await can't handle", but I agree that there's an issue there. Async/ await is definitely an incomplete solution, and Haxl attempts to address one area where the abstraction fails. Of course, there are always places where you can do better dealing with the asynchronous/ concurrent primitives, but just like there's a place for both manual memory management and garbage collection, I think there are use cases where these abstractions can provide real value.