It was ensuring a clean and thorough shuffle every game, to ensure nobody was getting an unfair advantage - except for the house, of course.
R when casino gambling took off in Nevada after World War II, the problem wasn’t clumsy guys who didn’t know how to shuffle. Shuffling machines were invented in the late 1800s when card games could be a life-and-death situation, especially if somebody suspected you of dealing from the bottom of the deck.
