My main reason for wanting gyro in Xbox controllers is that I believe that Windows would then also implement support for it in Xinput. That way it would become a de facto default controller feature and developers would have a reason to directly implement it in their games. Then we wouldn’t be dependend on Steam Input to use it at all.
From what I understand the leaks only mentioned an accelerometer, not a gyroscope. The capabilities without a gyroscope would then be more like a Wiimote without Wiimotion Plus and without the infrared stuff. So no precise positional adjustments, just shaking. The described use-case for it would be that the controller “knows” when it’s being picked up. So not even in those leaks there were any plans to put a gyro in their controller like every other company out there.
I wish more Playstation games would implement this, and Microsoft would finally put gyro in their controllers as well. I find aiming in games with just sticks really uncomfortable, gyro is a literal gamechanger.