Look, this is ridiculous. I don't mean to offend, although I probably have succeeded, but OP, you need to learn what it is you are talking about.
Shoot a shotgun. Or two. See what it means to fire a pistol grip 12 gauge without a shoulder stock. "Reduced recoil" means your wrist isn't broken, merely sprained. See what firing a defensive 12 gauge load feels like. Then, while the bruises are healing, ask your questions.
Come out to any shooting day sponsored by LIFE, HDA, or HRA. Coincidentally, Sunday, August 25, at the HRA fun shoot, shotguns are part of the training curriculum. You will have the opportunity to fire defensive loads through shotguns with pistol grips and shoulder grips.