I mean if your OS was “smart” as not to send IO to devices that indicate critical failure (e.g. by marking them read-only in the array?), and then thinks all devices have failed critically, wouldn’t this happen in that kind of system as well…

Rust is great, but might it be a bit premature to replace the venerable coreutils with a project boasting version number 0.2, which I imagine reflects its author’s view on its maturity?