None of us want to understand every single domain of knowledge from set theory or quantum physics up to cosmology or social psychology.
I personally have been forced to learn more low-level Unixy things than I ever wanted to. I want to write simple and elegant front and back end code quickly so I can spend my spare time honing UX and other human-facing aspects of my work.
I resent being flamed because I don't fully understand the subtleties of zsh or nginx or or whatever other shiny toy someone else happens to find essential knowledge. Your world might not necessarily be mine.