Response to the new Interface:
The first day the new dash was available, I was playing with a friend. Xbox party continuously disconnected, requiring us to reconnect (not sure if related). It was here that the deficiencies of the new dashboard really showed. Inviting a friend to a party now takes several extra steps, as does going into the party to manage it (to add insult to injury, THEY'RE DIFFERENT STEPS). Suffice to say, this alone is a serious downgrade to the smooth tap left to access party/ friends.
Switching to a game that isn't pinned now requires you to go to the far left corner, tab over, go home, rinse repeat until you are at your games and apps, and then find the game. Again, this is an unessecary number of steps for something that used to be easy.
Thus far, I have not found a single positive about the new interface. At all. Anything new is either too niche, or drowned by the negatives.
Overall, this is a good summary of the new system. Unintuitive, harder and slower to use, and possibly glitch ridden. The last dash wasn't perfect, but I sure miss it now.