Would really love to hear the Qualcomm lead PM on the real world use cases where this would be valuable. As for now, it's an extra reason to stay away from Qualcomm-powered devices.
Maybe Qualcomm is right and this is helpful and they will never spy you, but this feature add a future attack point, for criminals and governments who whant to track you and you can’t noticed it because it use almost no power. I hope they’re implementing very very well the security and the circuits to led the user know when the camera is looking at you actively.