Whenever I watch videos showing people playing with VR-HMDs (doesn't matter which one) I always wonder why the movement of the head is so intensive while there can't be seen an appropriate head movement within the game. Look at this for example, especially at 1:03 when the guy is looking to the left.
Sometimes it's like the game doesn't even react to every physical movement. 😕 Is this on purpose to slow things down, preventing motion sickness?
It is 1:1 always and should not be adjustable in a VR game - it makes you terribly ill otherwise. It is set that way by default in the Oculus SDK and most certainly the other dev kits. 3rd party injectors like vorpX do allow you to adjust look sensitivity (along with FOV, etc.) as it's needed to make non-native VR games look correct. I've adjusted that in Skyrim and it really needs to be as close as possible to not be a vomit fest.
I see what you're saying though. I watched my brother try out my DK2 and what you see mirrored on the 2D monitor doesn't match what the person experiences in the HMD because the FOV is different.