Surely true but I can imagine (ignoring all issues it could have) that a wireless detachable display would be a rather nice functionality.
(Also ignoring we are talking about usb3 and not the wireless model)
You could stream games from you pc to your handheld and use the controllers as the iControlpad.
The problems I see with this would be:
- draws more power
- why would you have a modular display in this manner, as a easily replaceable screen could also be suitable
- limits screen resolution
- screen has to have usb interface adding extra components and weight etc. (never mind the extra costs!)
- probably worse timings due to delays caused by overhead
- wireless model would use its own battery, causing even more extra components (charging, etc.)
The positive side:
- people not interested in the pandora could buy only the usb screen, for whatever reason (maybe as usb-drawingpad?) increasing sales
- can replace screen with more/larger better or different type of screen (e-paper screen for example)
- multiscreen option via usb-hub?
- no screen option, use pandora as iControlpad
- turnable screen, use pandora as tablet only
So I can not think of any positive functionality that is really convincing as a must have functionality.