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In Gentoo, Rust crates are just normal files to be downloaded in order to build a given package. The package pins (and checks the hashes of) the crate deps, and builds using cargo --offline. There is no serde/clap/etc packages, just ripgrep/librsvg/etc packages. There is no need to patch all packages to use the same serde crate version. Packaging a Rust program in gentoo is pretty much automatic.
Most distributions want to be fully self-contained, with all dependencies contained within the distribution. They can't download dependencies from the network at build time. So using crates.io isn't an option.