With a ducted fan, we can have thrust vectoring, can we not?The Miller JM-2 started out looking like this:
It performed better with an open prop than with the ducted fan.
I don't think thrust vectoring can be done as easily with an open propeller
Imagine doing 'Cobra' maneuver in an Archon, thanks to Ducted Fan Thrust Vectoring!
(and then if you have twin ducted fans, you can do independent vectoring on each, for greater roll control)