Async in Rust isn't exactly universally loved, partly because async Rust is perceived to spread progressively to Rust libraries making it less optional to use.

Async in Rust isn't exactly universally loved, partly because async Rust is perceived to spread progressively to Rust libraries making it less optional to use. See eg https://bitbashing.io/async-rust.html https://bitbashing.io/async-rust.html, "Async Rust Is A Bad Language"