I don't understand why a person would not want a shot gun as a go to gun.
A few reasons:
1. Pellet spread combined with possibility of innocents nearby. If one can barricade and keep the family behind the gun, ok. But, if there's a possibility that a precise shot must be taken, a single projectile might be preferable. Federal Flite Control and simple understanding of how the gun/load patterns is helpful here. One doesn't necessarily have to have a huge home, however, to start getting into ranges where spread must be taken into account.
2. Pumps require two hands to operate. I've gone through a supervised training exercise with simmunitions that had me on the phone with 911 when the bad guy charged (I mean charged
) through the bedroom door. The first shot had to be fired one-handed. Dropping the phone and racking for a second shot took a really long time under those circumstances. Which brings up...
3. Semi-auto shotguns are pricey. Some would say they don't have the universal reputation for reliability that pumps have. Except that...
4. Some believe practical
reliability of a pump is over-rated. Mechanically, not much goes wrong with a good pump. However, under stress, short stroking can and does happen. Human malfunctions are still malfunctions.
5. Even reduced-recoil 12 gauge buck kicks harder than most pistols or carbines. Can the user consistently control it in awkward, off-balance positions?
I'm not saying this makes the shotgun a bad choice, just that people may assign different pros/cons to it depending on their circumstances.