Since it is, or can be when over-utilized, trite. Try not to individuals have a tendency to be all the more intriguing the more unbalanced they are? Additionally, if there is excessively symmetry, the eye (or ear, or psyche) isn't attracted wherever specific; wherever you turn, you are at a place that you could consider as a creative 'focal point of gravity'. I think the feeling of balance and arrangement in any art should attract you, and not simply let you slip openly.
Different ways artists can make an outwardly engaging piece is by utilizing corresponding hues, for instance, or moving the focal point of an artwork to the sides, or utilizing negative space as opposed to positive, and so forth.