Exactly. Meta has successfully used this technology for years in their VR headsets. It's baffling that (to my knowledge) not a single normal FPS game has adopted the technology, even several years later.
Nvidia announced their version of this technology called Reflex 2 around 1 year ago, but sadly we didn't get any news since then
I'm not sure how Reflex 2 works exactly, but it doesn't improve frame rate, only latency, unlike conventional VR reprojction, which improves both (or at least camera frame rate). So apparently it's not quite the same.