It seems that the author places a lot of emphasis on the maturity and future prospects of various libraries. I'm surprised that Rust was so quickly dismissed as tokio seems to have a bright future ahead of it.

What I do think is a fair point is Rust's learning curve. With that in mind I would like to suggest a third alternative: Nim.

Support for epoll/kqueue/IOCP has been in Nim's standard library for a while now and is already very mature. The learning curve is probably somewhere between Rust and Go. In addition Nim also offers a GC that is predictable and controllable.