I only wish to offer a warning and not make the debate more complex, my view is that thinking in terms of the UI has drifted into just showing a pile of features, the debate seems to be how much we clutter a given tab etc. The UI went thru a total reset with the Qt port and any refinements that had emerged were lost, now in the rush to release 0.8 and add even more features we get more of a UI pile.
At some point I think it will be important to start taking the UI more seriously and have a specific UI/WorkFlow release, which means a feature freeze.
I don't think lux is at the point where this will be practical in the near term but at some point there will emerge a good resting place where we can pause, debug and perfect the feature set and then really dig into the workflow integration and functionality layering that is the true value added aspect of UI. This can be fun in fact, UI design does not always have to be tedious if framed correctly.
In this context I offer just one conceptual goal: Image first.