I don't think you're wrong that you can learn this stuff on the job, but a "primer" kind of class like this which surveys several useful tools helps new enginee

I don't think you're wrong that you can learn this stuff on the job, but a "primer" kind of class like this which surveys several useful tools helps new engineers develop pattern matching skills around how to continue self-teaching these kinds of things. Shell/scripty/vim-ey,linux-ey stuff can be really challenging to learn how to learn for some people.