One of the main benefits of async/await in Rust is that it can work in situations where you don't even have threads or dynamic memory. You can absolutely use it

One of the main benefits of async/await in Rust is that it can work in situations where you don't even have threads or dynamic memory. You can absolutely use it to write very concise code that's waiting on an interrupt on your microcontroller to have read some data coming in over I2C from some buffer. It's a higher level abstraction that allows your code to use concurrency (mostly) without having tons of interactions with the underlying runtime. Every major piece of software that I have worked on has implemented this in one form or another (even in non-modern C++ where you don't have any coroutine concepts, Apple's grand central dispatch, intel's Thread Building Blocks, etc). If you don't then your business logic will either be very imperformantly block on IO, have a gazillion of threads that make development/debugging a living hell, or be littered with implementation details of the underlying runtime or a combination of all 3. If you don't use existing abstractions in the language (or through some library), you will end up building them yourselves, which is hard and probably overall inferior to widely used ones (if there are any). I have done so in the past, see https://github.com/goto-opensource/asyncly https://github.com/goto-opensource/asyncly for C++.