The only other thing I'd add to this list is that Cargo and crates.io predate Rust 1.0, and that (subjectively) Cargo is an excellent package manager. So taking

The only other thing I'd add to this list is that Cargo and crates.io predate Rust 1.0, and that (subjectively) Cargo is an excellent package manager. So taking a dependency on 3rd party crates has always been simple and consistent in Rust, and the marginal added convenience of having something in the stdlib is smaller than in most other languages. In contrast, the Go tooling leaned pretty heavily towards monorepos and vendoring for several years, before the standardization of go.mod.