> What user benefit are they promising? From their README, they promise better error messages, extensions when relevant (example: --progress), and Linux, macOS

> What user benefit are they promising? From their README, they promise better error messages, extensions when relevant (example: --progress), and Linux, macOS, Windows and other platforms support. It is my understanding that the GnuWin32 coreutils were last updated in 2017 and had some subtle differences to regular GNU coreutils, so that's one set of users for whom there's clear benefit. Faster speed could be accomplished if architectural changes are viable, but for many of these tools they are IO-bound.