Have you used busybox? The BSDs? I'm not sure adding more features to coreutils is a major help, and given rust-coreutils/uutils has:

1) more CVEs between two latest Ubuntu releases than coreutils has had over the last 30+ year

2) managed to break security updates

3) is neither fully compatible with POSIX nor coreutils

I'm not sure why I'd ever use it? Sadly, projects like uutils have made me suspicious of rust projects, so unless I know that the project is well maintained (for which there are numerous examples, ripgrep being the obvious example, but newsboat, the various tools from proxmox, servo/firefox, and the pgrx ecosystem are ones I use regularly), it's a negative marker against that project.