There is a versatility to simple ribbing. It fits well. It moves with the wearer due to its innate stretch. It is completely reversible, with the wrong side being just as wearable as the right side. And it is an excellent solution for variegated yarns if those are your jam. Add in an unexpected twist, like using an odd number rib like 3 x 1 instead of 1 x 1 or 2 x 2, and you’ve got an interesting piece to wear with two completely different looks. Magic!