Xbox just needs to enable straight up passthrough and let the receivers do the heavy lifting. Especially if they don't include all audio formats.
Just say no mixed audio during passthrough, it's that simple. Mixed audio is only useful for music and games anyway and snapped music sucks.
The S doesn't have me overly excited, had MS came through with more features better media interfaces, plus my youtube subscriptions, netflix etc in the one guide I would get another for my living room. Until then I'm sticking with Android TV.
Scorpio on the other hand has me very intrigued. I see one in my future. Wife will be happy too, I've high jacked my gaming PC and put it in my media room, and made my Alpha the main house desktop PC.
Sony 75" X940D, 7.1 Klipsch, Onkyo TX-NR656, Xbox One/360, Nvidia Shield Alienware Alpha, Arris Gateway, 42" Samsung