Ya after doing my own buckshot penetration tests, no thanks.
And after taking some tactical shotgun courses, there is no way to effectively/efficiently use a pistol grip shotgun. They have one single advantage... Easy to pack.
In my first course, I ran a folding stock which I had modified to fit me perfectly, perfect check weld, automatic sight alignment. It was a fairly effective setup. Fold for packing/carrying, open for use.
But after fiddling with other competitors shotguns i quickly realized there is better options and mine had seen some changes. Now I'm running a Mesa tactical m4 adjustable stock adaptor (modified the stock for my face) and a 6 round side saddle.
Imo if you are going to pack a defensive weapon, you may as well carry one without compromises. It doesn't have to be expensive either.
mine is just a mossberg maveric 88 $350, Mesa m4 kit $140ish (iirc)
side saddle $40ish, and some sling adaptor that I used as a flashlight mount $10.