This does not make sense to you because you are looking from a technological standpoint. The reason to rewrite coreutils (or sudo) in Rust is not technological,

This does not make sense to you because you are looking from a technological standpoint. The reason to rewrite coreutils (or sudo) in Rust is not technological, as there is no merit. Coreutuils are titanium rock stable tools that no one asked to rewrite. And this is precisely why the worst Rust evangelists aim to rewrite it: virtue signaling with no suffering of the opposing party is not good enough.