Good points. There is the possibility that a Lumina user will turn off desktop icons, and or all panels actually. We would want to allow Lumina to be customized to fit any style.
We could also consider re-imagining pc-mounttray, pc-mixer, pc-nettray as completely new Lumina embedded utilities. Imagine what was mixer is now actually a volume slider, or can be transformed into more like audio levels. Imagine what was nettray now shows signal levels, the network connected, packets per second, and when clicked opens a list of networks. Then an embedded utility to replace mounttray simply shows removable media, and network mounts on the desktop that can be right clicked to unmount.
Even with desktop icons view disabled, and display desktop folder contents disabled the embedded applications such as application launchers can remain viewable.