To me, ammosexuals are a lot like people who fantasize about their zombie survival strategies. There are much more pressing concerns that are (a) more likely and (b) need to be defended against. I don't care how badass you look with your baseball bat wrapped in barbwire if you're trying to eek a living in an environmental catastrophe while dying from an antibiotic-resistant infection.Unfortunately, I knew waaaay more ammosexuals who were all about confrontations and killing the intruder than those who were packing bird shot or rock salt. They weren't really worried about trying to escape, they practically fantasized about killing someone who broke in.
Ammosexuals are scary. But honestly, so is the person who puts rock-salt into their shotgun. There is an intensely thin Venn intersection when it comes to "people who need to be shot" and "people who will be stopped by rock salt". If you're shooting someone, it's because you're shooting someone who needs to be stopped, for life-and-death reasons.
I would never disagree with a 12 gauge for utility. I only see '20 gauge' when it's specifically home defense. They're so much easier to use compared to the loss of stopping power. As well, the number 3 shot gives a much better lead/recoil ratio in the 20.