They have a huge impact if you want to play light gun games on CRT, where timing being out by a few micro seconds prevents your light gun from registering at all
You cannot make 80s lightguns work on an LCD. When you pulled the trigger, the system drew out a few white boxes where the targets are, and how long it took the gun to "see" white told you which box you were aiming at, because of the raster functionality of the electron gun. LCDs always output an entire screen at once, so that cannot work.
