There's not much to contribute there. They are small simple utilities some Unix admin wrote for their own convenience some 50 years ago. The equivalent to a little shell script, where they had not much shell yet.
GNU overengineered them a bit and that's it.

Their point is, that every system has them, with the same interfaces and behavior everywhere.
If you have to rewrite them, make them better but name them differently. Like tools like ripgrep, fd, bat and the like.