Just to follow up a bit: Rust excels at things like command-line utilities, or high-performance libraries (that don't require you to suck in a whole framework.

Just to follow up a bit: Rust excels at things like command-line utilities, or high-performance libraries (that don't require you to suck in a whole framework.) In these cases, the case for "async" isn't strong, because chances are there isn't enough concurrent IO to for async vs threaded to make a difference. If you're making a web application, chances are you're hosting it yourself. Thus, you don't have to "ship" your software and compel your users to load up whatever framework(s) you choose. IE, you can choose to use C# or Node.js, and decide that it's worth your time to spend more on hosting.