I have zero issue changing my flights as many times as I want, and use that benefit often for both awards and purchased tickets. Traveling as much as I do, I really value the flexibility. Additionally, and perhaps most importantly, If there was more award availability, I wouldn't need to change as often as I do. IMO, its one of the few differentiators between them and Delta, and one of the key reasons I have kept my business with them after all the devaluations.