so correct me if I am wrong.

The pros of KDE is:

-turning the N800 in a portable desktop
-Have Koffice great for documents and the go (ppt, doc, xls, and so on).
-you can compile apps out of the box and to not need to modify any code to port them (well, modify any code to hildonize anyway) {This is great for me }
-full desktop experience
- PIM

Did I miss something?