Because a secondary should hit hard without you having to be within melee distance of something strong. Your not using a secondary on dregs or thralls (unless you use 1 in the abyss) so it's usually on a boss or yellow health bar enemy and shotguns put you too close without doing significant enough damage to warrant using one.
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I think shotguns could use a bit of redesign. Add range to it, but reduce maybe PVP damage?
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I beg to differ. With the right gun and skill you can take down yellow bars fast and easy. I do it all the time. People are too scared to get close and that's why everyone snipes