Thanks for your comment!
But I think Python Asyncio has nothing to do with green threads. event loop runs on 1 process, 1 thread and no "green threads".
but "not be smart enough to prioritise requests that are almost ready with their responses" is true about async libraries, they just loop through all tasks and check for incoming bytes from socket. There is no prioritisation as i understand, because there is no way to see if the socket is "almost done" getting bytes.