First of all, you don't need laserlike precision for kyusho to work. Secondly, nerve, pressure and other "point" striking of vulnerable or important organs and manipulation of physiology to make an opponent more vulnerable to attack should always be used. Thirdly, kyusho is oftne used in self defence common with jujutsu where you are seized, thus offering up stable and open targets.
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It takes a village to stone somebody to death.