No one would argue that, but most would prefer using window's "search" to find all files with "curly" in the name over typing in "ls -alR | grep curly" at a UNIX prompt. I'd also rather drag and drop from a file manager than enter something like "cp ../../../../../home/whisker/*.zip ." to move files around. CLI has it's place, but GUI's are easier to learn, more efficient for people who type like I do (fat-fingered,) and less intimidating for users who just want their applications to work.