You just don't know what you are talking about. You are essentially saying horse carriage was great for transportation. A car isn't an upgrade. PC gamers were fine with 60hz monitor. 120hz is not high end/is not needed...
high end mice are essential for certain games; esp esports ones.
Please, 120 Hz monitors and "high end" mice are the PC gaming equivalent of audiophile equipment. Provides no actual benefit other than the user believing in it.
The difference is not linear but I switch between 60 and 144 Hz monitors, as well as ordinary and high-resolution mice, on a regular basis, and the difference is definitely noticeable.
Neither of these things are "high-end" anymore though. You can get decent high-res mice for $50 and 120 Hz monitors for $250.
