The basis of a UI should enable a user (specified by the ‘U’ in UI) to interact with a computer or similar device in a fashion which enables the user to control and assess the state of the system. This, these days on most computers and media players etc., is done through an interface (the ‘I’ part in UI). While it doesn’t have to be easy and coherent for a human to understand, having it understandable and useful is generally an advantage. What I mean is going out of your way to make it more difficult and less understandable to use is not generally a good thing!