Async is much easier to program than threads (even thread with Rust). You might be working very low-level where you don't have an OS and thus no threads. Rust's

Async is much easier to program than threads (even thread with Rust). You might be working very low-level where you don't have an OS and thus no threads. Rust's works on those devices too. Like you can use this to implement an OS. I think that there's going to be a new os written in Rust. It will be much lower level than all the current OS. You don't need a lot of protection when the compiler protects you.