In this case I agree. Small, short-running programs that don't need to change much are the easy case for C, and they had plenty of time to iron out bugs and handle edge cases. Any difficulties that C may have caused are a sunk cost. Rust's advantages on top of that get reduced to mostly nice-to-haves rather than fixing burning issues.

I don't mean to tell Rust uutils authors not to write a project they wanted, but I don't see why Canonical was so eager to switch, given that there are non-zero switching costs for others.