Very true but if that someone is a Windows user and has never seen Linux they do not have a Linux machine to follow such a tutorial along with in the first place. You see the chicken and egg problem here.IMO if someone isn't able to read a tutorial how to do something on linux in a terminal he or she'll have a hard time anyway, better to learn it from the beginnings...
The whole point of the Raspberry Pi was to get kids and others who have no programming experience interested in it and make it dead easy for them to get started with a "real" computer that they can trash to their hearts content. That brings us to the fact that they will need to get familiar with Linux to some extent.
If that someone is a Windows users and has never seen Linux then the above requirement calls for a super super simple way of getting them set up with a Linux system, which they will then use to learn some Linux.