Where good glass really shines is sheep or goat hunting. When you need to reach to the other side of a valley and size up an animal you just can't have poor glass. Trying to judge whether a sheep is 4/5th curl or just inside a 3/4 curl at 2000 yards is very difficult. You can select to spend a half day humping across the valley and up the other mountain only to find it is a 3/4 curl or you can buy good glass. In those conditions that extends from the rifle scope to the binoculars to the spotting scope.

Nothing is foolproof to a sufficiently talented fool.