When did you last time use Motion Reprojection? With current iteration WMR MR at 45FPS I don’t detect any MR artifacts.
With 30FPS I see very minimal artifacting if I look 90 degrees to my side near the window frame where there’s no pixel information for MR to work with. That’s a small price you pay for a butter smooth experience especially when you don’t even notice them when whizzing 500kts at 100 feet. … Because you know, at that altitude and speed looking to the sides you’ll auger in.
On higher altitudes the only noticeable artifact diminishes as the pixel velocity near the window frame is negligible and becomes something you don’t see.