[xorcist]

But that's hardly relevant to coreutils, is it? Do these utilities even manage memory?

These are command line utilities meant to be a human porcelain for libc. And last I checked, libc was C.

Ideally these should be developed in tandem, and so should the kernel. This is not the case in Linux for historical reasons, but some of the other utilities such as iputils and netfilter are. The kernel should be Rust long before these porcelain parts are.