It sounds terrible that your controller would recognize that it's not in use and use less battery? Alright...and Im talking about TV features in general. There are people who act like no one watches TV through their Xbox One, just as people are acting as if no one used Xbox Fitness. Yes, people use both.
And people I've talked to have different experiences with the posture correcting. As for the comment about the purpose of your purchase...whatever. If you buy a product to fulfill a need and then it no longer fills that despite the promise to, then you can be angry. And LOL at the priorities shifting, dear god.

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