If anything you have the magic of being able to keep refreshing too. It's a useful tool, especially if you're doing last minute ones.
I thought I wouldn't get dinner at BOG on a Saturday night, but the day prior I keep hitting that refresh button on and off for a couple of hours while at work in the morning until I got the right reservation. People refresh a lot for FP too, but unlike FP, dining reservations you do have to cancel ahead of time if you do not want to pay a penalty fee. So, if people aren't coming / going to make it, they're more motivated to cancel those reservations.