What specific circumstance would mitigate the use of a full stock shotgun?
Storage space in small rooms or apartments, storage space in vehicles, storage space in a pack while camping or hiking..... in two words, storage space.
A birdshead grip PGO is the most compact shotgun you can get. It's also about $100 less than even budget-priced pistols, like Taurus, and I will never susbscribe to the theory that pistols are more effective weapons than PGO 12 gauge shotguns.
I agree with the OP, in that Hickok45 in that video has demonstrated the ability to use a birdshead PGO with enough speed and accuracy that it would be effective in a home defense situation. He also demonstrated enough accuracy with high brass slugs for using it for defense against 4-legged critters.
Do I have a PGO shotgun? No, the circumstances of storage space that would lead me to use one don't apply to me. I have enough room in my home for a full stock shotgun, and enough room in my vehicle for a folding stock shotgun. I don't camp or hike often enough for one either.
I also take some issue with the Moderators' stance on PGOs on this board. While I don't agree wtih posters accusing the mods of belittling people who own and use PGOs, I DO believe that the Mods look the other way when users make posts belitting other users for owning and using PGO shotguns.
Unfortunately, I do believe, that THR is not a board where there can be PGO discussion without chiding and belittling of PGO owners.