In order to simplify WordPress I would suggest to:
- Eliminate the concept of "pages" and "subpages".
- Change the concept of "categories" for a new one of "tree categories" (permiting a hierarchical structure of posts) with options for start new "child categories" and "sibling categories".
This category tree would functions like the filesystem tree in Windows Explorer.
This idea is really from an open source software focus on text research called TextCite (http://textcite.sourceforge.net/index.html).
Thak you for your attention,