It is true that resolution is diminished in today's VR, especially if you are used to better-than full HD (above 1080 x 1920). Since I migrated from 1080 to VR, I am not missing as much as someone used to higher resos. So there is a give and take happening. Also, I have a very wide peripheral angle, one that approaches 180 degrees. Looking forward, I can still detect both of my shoulder-points, though they are out of focus. I also have pretty good flexibility in my neck, so looking backward, I can see nearly to my 6 position without much twisting of my torso. With the headset on, I loose a considerable amount of periphery, so I need to move my neck and torso much more than in real life. However, after about a minute of VR exposure, I seem to adjust to that limitation.
While the Rift S has noticeable screen door effect (you are seeing the actual pixels, it seems), it is not too distracting to me as motion blurs that effect. I did find that I was able to pick out aircraft against the ground clutter better than in the flat monitor environment. However, ground objects were a tad bit more difficult for me to pick out, since I don't have the zoom feature (or figured out how to use it in VR yet). This was in lighting where the sun is low on the horizon. I'm not yet sure how much things will change in better lighting... either for the better or for the worse. Experience will be my judge.
One thing that is WAY better is calculating/judging deflection shots, especially those where the target falls below the nose of your ride. It is amazing how 3 dimensions/depth perception can help your intuition when mentally calculating the blind shot. I think it has something to do with the constant motion of your view as you adjust your head height and lateral movement... It adds to your inherent sense of immediate space and time. Instead of moving my plane to get quick glimpses of my target, I was able move my body (to shift my point of view) while still maintaining a fairly constant flight path. So if you are a pretty good deflection shot in 2D, in 3D, you will instantly become expert! If you are struggling with this discipline in 2D, you will become instantly proficient. The change is >that< dramatic.