The discussion should feature prominently somewhere on top that the comparison is between the Tokio async runtime and Linux threads. Reason being, people not familiar with Rust may assume that the discussion applies to Rust async in general, when it doesn't necessarily. Sure, in practice Tokio is pretty close to being the de-facto async runtime in Rust. But it's not the only one, as Rust's async language constructs allow for different runtime implementations that may be optimized for different use cases.