King; the main answer, I believe, is flinching. Some shooters develop a flinch, and have found that a lighter trigger eliminates it. I am not recommending that, just reporting why I have seen shotgun triggers lightened.
Trap shooters who shoot thousands of rounds go that route, and often finally opt for a release trigger. I am not intelligent enough to tell you why that works........but can tell you from experience that it does. I would NEVER recommend a release trigger on a field gun however, and am not crazy about really light triggers on field guns, but I believe the reason is attempts to reverse a flinch.
Sincerely;
Sam Ogle, Lincoln, NE
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