Such folks just don't want to bother with the limitations that a secure system implies, even if such a system became much more featureful than the present ones. They want their Windows/Mac and probably want it for their work-groups.
It's not just a lack of technical know-how but a variety of psychological tendencies that stands against this. It's taken a long time for companies to develop UIs that people want to use but the existence of these "easy to UIs" is a barrier to any UI which requires even a small amount of training to use.