>>unless our knowledge of physics advances and SoL is no longer a limit
The latency of the human mind is around the same. There are lots of tricks like predicting the future game state that can result in a better user experience.
UI Response time is at most 100 ms [1], as anything more that is very noticeable laggy.
Actual perception times are much lower than that, about 13ms [2]. You can see the difference for yourself by looking at a 30FPS (33ms) and 60FPS (16ms) video [3], and the effect is much greater when you're actually providing the inputs.
The latency of the human mind is around the same. There are lots of tricks like predicting the future game state that can result in a better user experience.