Neutron - the main benefit of the Nomad is it converts video from the HD DVR to the storage in the Nomad, then it lets you download to an iPhone etc and watch anywhere. Key benefit being no cellular data usage and able to use it anywhere, such as an airplane.
I'm sure if DirecTV wanted to do it they could make a place-shifting streaming solution, whether via Nomad or something else. Directv seems to be much more focussed on keeping content companies pleased, the exact opposite stance of Dish, who seems to enjoy lawsuits with any company they do business with.