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One of the primary reasons is due to hardening of the brass after repeated resizings . Even with neck sizing dies this tends to occur and can lead to neck splitting . If you track the number of times you have resized and insert an annealing of the necks every 3rd time you resize you will prolong the life of your cases greatly. Of note also if you full length resize your brass and find you have to trim very much brass each time after sizing then you are working the brass pretty hard and it will thin fairly quickly. Waiting for case head seperation or thin / brittle neck signs to show up doesnt appeal that much to me. I have too much $$$$ tied up in some of my firearms to risk damaging them over a couple of bucks worth of brass. Tracking the number of times reloaded and making notes gives me some idea of when the brass is due for early retirement.
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