TL;DR: For gaming, because ‘input lag’. [In a CRT] the electron-to-photon exchange happens instantly. While CRTs do have some sources of lag —namely, the time spent buffering each video frame and scanning each line of the frame from top to bottom on the screen —those delays are on the order of microseconds. When you move your mouse or press a button on the keyboard, the response time is imperceptible... By contrast,…
That's wrong, on a 60Hz CRT it takes the beam 1/120th of a second to reach the center of the screen, which is an average lag of 8.3 milliseconds. There are LCDs with 9ms lag.