I think the compatibility concerns are legit at least in principle. That said, if you look at the issues, 8 of the test failures are exotic edge cases in ‘tail’. I for one am not hitting these utilities hard enough to run into that kind of thing. These utilities are already good enough for most of us.
I am a fan of the benefits of Rust. The fact that RedoxOS and Ubuntu are shipping the same Coreutils as we exit 2025 is amazing.