What exactly does the reprojection option in the VR settings do?

[stekusteku]

I don’t now for sure, my bet is;
99% no support for motion vector
90% no support for depth
You can search the forum for the post on this subject by mbucchia.

Do Microsoft/Asobo just not care about VR users?

Explanation by mbucchia: Q: What is the motion reprojection setting in Flight Simulator VR settings doing (“Depth and Motion”)? A: Short answer: it does nothing today. Long answer: it implements something called application-assisted motion reprojection, also called AppSW by Oculus. It requires your OpenXR runtime to implement a feature called XR_FB_space_wrap, which as of today, no runtime implements (not even the Oculus one - the only implementation of AppSW today is for native Android apps…

Pimax - Microsoft cooperation is 99% marketing only.