It is a simple application of Murphy's Law that if the difference in aperature matters at all, it will matter in a crucial situation. For instance, this year I spent all season, off and on, pursuing a large buck that I knew resided in a particular area of the Everglades. After opening day of archery, on which I saw him at well over 300 yards, I never saw him again until the last 5 minutes of shooting light on the last day of gun season. I caught him in the open at 70 yards and had a fiendish time distinguishing, very quickly against a wooded backdrop through my expensive 32mm roofs, that he had in fact already dropped his horns. 99.9% of the time it might not matter at all, but that one time it might matter a lot.
