Well with the top off a passenger could get their ankle scuffed up, the lower cover has adjustment markers on it. If you're really looking for a cool look take the belt hubs off,put sprockets on and put a 530 o-ring chain on.
Been running for almost ten years without either belt guards without one issue, and that's been with riding on the occassional gravel road too. The OL would have to have something like 10" bell bottom pants on for it to get caught in the belt.