I don't want to see a large standard library for Rust. If something is added to the standard library, then it is very difficult to change it afterwards because backwards compatibility.

It would be better to have blessed crates in crates.io. The Rust core team would release or audit them. If the blessed crates need breaking changes, it can be done by increasing their major semantic version number. That can't be done to the standard library.

Actually, there could be a "trust" level for crates: 1. blessed crates by the Rust core team, 2. trusted developers, 3. untrusted developers. Or something like that..