> Web backends tend to have lots of concurrent connections doing IO-bound things. Processes or OS threads have too much overhead for this Depends what you are

> Web backends tend to have lots of concurrent connections doing IO-bound things. Processes or OS threads have too much overhead for this Depends what you are doing, how you are doing it, and how careful you need to be with resources. The article is about the fact that it is often OK even when done in a particularly inefficient way.