Similar to how when designing a virtual face, it looks more natural if it has some slight asymmetries and "defects", and when designing a synthetic drumbeat, if

Similar to how when designing a virtual face, it looks more natural if it has some slight asymmetries and "defects", and when designing a synthetic drumbeat, if it's "perfect" it sounds totally robotic. Imperfection is natural and comfortable. Perfect corners and edges are artificial and weird to the distracting point.