One place I've found it useful is for scripting the setup of a fresh machine, something like this:

https://blog.vandenbrand.org/2016/01/04/how-to-automate-your...

I agree it's likely very few people use it. It can be exactly the right tool for the job in some circumstances.

Yeah, that's a good reason to use it, and it makes sense that the tool is there. But there's a big difference between having a CLI tool for digging around when you need it, and having two separate GUI control panels with some settings in one, some in the other, and other settings in both.