I think, when Ayoob speaks as a professional witness, it’s worth hearing what he has to say. I don’t completely agree with some of his points (eg, trigger modification), but I do realize he’s bringing points that will make his job easier should he be called to defend any given case.
On the subject of guns/ammo, and effectiveness? He’s just another gun writer, who’s paid to say positive things about guns & ammo that his publisher wants him to write about. I’m sure that if there was something that was absolute crap put in front of him, he’d say it…which means you’d never see the article (this does happen fairly often when an item is complete dreck; they just never publish a truly negative review).