Turning your head to look generally means you're no longer looking at the screen, making tracking your head movement to move the camera pointless. If you have a multi-screen setup, when you turn your head to look you should be looking where you need to without turning the camera, making tracking your head movement to move the camera pointless. If VR is supported, it typically already handles this sort of thing, making this redundant.
As for mouse look being mapped to the controller - you can already use the right stick to look in that fashion by default.
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