It helps dispersing jobs like backups. If you have 20 servers, your backup storage is not hit by them all at the same time. Even better, because it takes into account how long it runs, if two servers hit it at the same time, the reduced performance will automatically spread the server that took longer behind the other. That scheme reduced the needed capacity in network and CPU of our backup servers a lot.

If it ran every hour, all servers would either hit the backup store at the same time or you would have to manually disperse them. Randomized Delay is great if you want to avoid this problem with short running jobs but it doesn't work well when most jobs take 10 minutes or more and the delay becomes larger than the timer's repeat interval.

So in that case, using a "run every 60 minutes" scheme is a massive advantage that reduces coordination needs.