Your modern word processing software seems as low or slower at reacting to UX than old 16/32-bit processors from the 90s, even though your computer is exponentially faster.
But this completely ignores the RADICAL improvement in capability. The latest word processors may not render at 60Hz, with 16ms latency to UI events, but they are multilingual, they support vector fonts, they have collaboration features, and on and on.
Some basic phone operations might be more convenient on an old feature phone than a modern touch phone, but the smartphone delivers to much more.
Our transportation infrastructure is our nervous system, our circulatory system. Maybe adding more neurons won't let you think faster. But it might make you think in ways you couldn't before. Other animals can process and react to stimuli vastly faster than we can, but our 'latency' perhaps affords us greater capabilities.
More than thinking about individual latency, it might be worth considering whether hyper-mobility benefits the overall system granting group benefits that exceed individual costs. (or positive externalities that exceed negative externalities)