Most people aren't sysadmins, but occasionally have to do sysadmin-like things. I've been programming with python and go for years. I've never been able to get the "core" command line utilities to really stick in my head. A sysadmin uses them every day, whereas I rarely have to reach for them. On the rare occasion when I _do_ have to reach for them, it is excruciating (what was the flag I need for `find` again?). If it were life or death and I had to debug even the simplest sed/awk command, it would be death for me! But this package makes perfect sense to me and really enables me to write this sort of quick and dirty thing in a language I'm familiar with and can confidently maintain.
This isn't for everyone, but there's definitely a population that can get a lot of value out of this.