I didn't see the original comment and I may take this better since it isn't my code but I don't ser this comment as negative.

If gives clear criticism which I can easily brush off as the way I want my library to work, but that when I read it I can agree with.

One if my major gripes with many libraries doing asynchronous work is that they just blindly assume I will be using their blessed event loop when in reality I already have an event loop. Which means I now need to put their code in a new thread, regenerate events and pass that to my event loop, that tends to add complexity.