Maybe my brain has more tolerance to low FPS and missing details. I played FSX years ago and could live with its 15 FPS. I also are quite nearsighted, which means in my early childhood I was more used to not so clear views. 
That being said, I did find that SS=2 and TAA=30% brought me much brighter, more crisper, and more stable graphics than SS=1 and TAA=60%. The latter was unplayable even for its cartoon like colours.