Actually, The Grio is also that way: The Grio is on satellite Ch. 360 in SD and on Ch. 361 streaming in HD.
I agree with you in why don't they simulcast some of the SD channels in HD via streaming. I would love to have Oxygen, Stars Encore Family, MoviePlex, TV Land and the other Disney channels in HD. I have a FireTV Stick also connected to the same HDTV as my Dish Hopper3. When I want to watch Oxygen on Ch. 127 (and the others streaming in HD), I have to switch video inputs to my FireStick and launch Dish Anywhere, which is a pain!
Why not integrate the Dish Anywhere HD feeds into the satellite guide as separate channels. I think the issue in the past was that you could not record the streaming feeds, but that issue is now fixed.