[roca]

There are no real advantages to putting Tokio in the standard library. Cargo makes it trivial to manage the dependency.

There are some real disadvantages to putting Tokio in the standard library, for example tying Tokio releases to the standard library release cycle and making it difficult/impossible for people to use non-latest versions of Tokio.

[MuffinFlavored]

Look at all of the flack the JavaScript ecosystem gets for having everything as a "dependency", and in this thread 3 people are cheering that Rust makes the executor required to do anything with Futures a third party library. Wild.