I don't think that's true that they use them because they're linked to slot machines. Sometimes variance just adds variety, which is valuabke in itself. I als

I don't think that's true that they use them because they're linked to slot machines. Sometimes variance just adds variety, which is valuabke in itself. I also don't agree if you're implying this optimization is intentional. It's often just a way to make the game longer. People don't like a game they complete quickly