Once again, the article is about JavaScript and everything it says still holds today, introducing async/await didn't change anything. Sync functions can only ca

Once again, the article is about JavaScript and everything it says still holds today, introducing async/await didn't change anything. Sync functions can only call other sync functions and use the result immediately. To use an async function, you have to convert the caller to an async function too which can be anything from annoying to impossible. So yes, Rust still has colors, but it doesn’t matter because a red function can call a blue one without a problem and vice versa. You’re right in saying that async functions have a cost and shouldn’t be used indiscriminately - so just use them when it makes sense. As opposed to JavaScript, Rust doesn’t make you commit to one or the other early and either face major refactors in the future or pay the price of async when it’s not required. P.S. I think there are some caveats for library authors and also to blocking the thread on a single future, but maybe more qualified people can comment on those.