Thats because a lot of users dont really want to use Windows, or the computer in general. They use it, because they have to.
For the same reason, i would never know what to do when my car breaks down. Sure i can look under the hood and do this and that. But its not my area of expertise, and its not something im interested in.
I'm a sysadmin, i know almost everything about powershell and then some. That doesnt mean my users do though. For them, a computer is a magical black box thats supposed to "just work" by clicking here and there. Just like a car is to me :)