There are times when endurance is very useful eg holding although range is usually more of a consideration. I know I've used it on a number of occasions because of traffic, weather or the like ("There I was in the middle of the night over the North Sea in a gale waiting for FISO/ATC to get to my alternate so I could do the approach yada yada"). Sometimes the only way to carry sufficient fuel for the flight and still carry the payload is to plan holding at best endurance and alternates at best range speeds.