Yes, but do you actually need to know that? I know that, I've been using Linux since the whole thing fitted on four 1.44MB floppies. I don't *care* though, and if my machine is fatally screwed up I just bust out the latest Ubuntu LTS, flatten, and reinstall.
I haven't got time to muck about with rescuing a broken system. I've got stuff to do.
Do you actually need to know JavaScript? Or C? Or Japanese?
As I said, if Linux is just the OS you use to do something else, then no. If your job/hobby is to actually develop Linux or tools that tie very tightly to Linux and how Linux operates, then yes.
I haven't got time to muck about with rescuing a broken system. I've got stuff to do.