Xeshra: The reason why the specs in the past was much lower is simply because we was technically limited, so we had to fake a lot of things and scientists was trying to find some good explanations trying to explain why we do not need more than this. The brain is starting to compensate "the lack", thats why they came to such conclusions. Wrong, because the brain actually is having a big load by "smoothen out" all the fake it gets... ultimately able to cause fatigue or even worse matters. Most people may not be affected or only "over time", but with increased quality of the picture the fatigue will decrease aswell. I still love the good old games but with improved tech, if there is some possibility. This is a huge work but this is the way "how to bring it over to the new era", improving the original purely technically without any changes made in a artistic way.
dtgreene: I'd argue that this only really applies when the graphics are reasonably realistic. For games with 2D graphics that are not even close to realistic, I suspect the brain doesn't try to make it realistic and instead interprets it as like a semi-abstract representation.
I note that the games most likely to give me headaches for visual related reasons are earlier games with "realistic" 3D graphics, like Daggerfall. (Note that camera movement doesn't help matters; that's one reason why I would rather not use mouselook on this sort of game.) But give me Super Mario Bros. 1-3 (or World), and my brain has no trouble keeping up; in fact, I think it's easier to tell what's going on in these games.
Interesting perception... could be true because the issues is usually only appearing on "realistic 3D graphics".
Ultimately, different games may need different tech and as more realistic it gets the more performance may be required.
Ugh... Witcher 3 is now the biggest GPU-destroyer: With almost all setting maxed, shadow and grass 1 lower and RT is set to performance only... i barely can manage 120 FPS in 1080P. In 4k settings it have to be reduced way more and dynamic resolution i guess. Dependable on game, the hardware is still not sufficient.... although i kinda got a monster inside.
https://ibb.co/Pc02YHB So far no game with bigger demand found... (normalized to 120 FPS)
GPU 97% load = 406 Watt fan speed high at 81 C. CPU some cores are over 90% load at 77 C (highest so far).
In general, very balanced system for full setting@ 1080P/120 FPS or reduced settings 4k/120 FPS. The CPU is surely sufficient in order to achieve 120 FPS on every game but not by far. The GPU is not at the edge of what may be required, i would say it would not hurt getting a GPU even twice that powerful.
Still: Many settings can safely be reduced with almost no quality loss... so it is kinda a unnecessary performance hog. If i reduce non required settings the system is now pretty capable.