The UNIX GUI Manifesto

GUI fragmentation is the greatest competitive weakness of UNIX. There is no standard Unix File Manager or Text Editor or Help -- that's shocking, in this age! Every Windows or Mac machine has a standard file manager and text editor and help system. The casual end user can accomplish elementary end-user tasks without encountering anything different from machine to machine.

Hoffman, Michael. Hypertext Navigation. Design>User Interface>Operating Systems>UNIX