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3.5 inch how much more range does it buy you?

I like to classify shotgunning into upland and waterfowl:

1 Upland.....Give me a prudently loaded 1 Oz 2 3/4" 20 Gauge and I'm ready to go and won't ever want more gun than that.

2. Waterfowl causes me to reach for a 12 Ga and 3" shells and only because I use steel shot because it's affordable and when I get enough shot in the pattern it works great....

IMO the 3 1/2" 12 Ga is a marketing man's dream.....and not much more of use to the hunter.