Curious why HD would matter. With a screen that small, SD and HD look the same.
Several reasons; 1) So you don't have record two version of the same programing on your 622, one for on your BIG screen, and one to travel with on your PocketDish
2) When programing is only available in HD you wouldn't be able to watch it or your PocketDish 3) Being able to get a MUCH higher quality if not HD picture on a TV you connect your PocketDish too when you travel with it.
We all know that Downrezzed HD is going to look much better than SD picture quality is on the Dish Delivered SD Channels, especially if you connect your PocketDish to a TV someplace else other than your Home, ie Hotel, Friends House etc...