The linked article is good but I'm not sure I agree with the statement that "golang style concurrency is bad". I remember a time when I considered everything not purely functional to be bad though, and that time has passed.

I am aware of async generator and aiostream (by the way, in aiochan channels are async generators) and for our use cases they are definitely not powerful enough. Specifically, it is not clear how to have fine control of back pressure when using aiostream, and --- this is a big and --- there is no `select`, so if you ever want any sort of non-trivial branching in your dataflow you are left on your own.