The bead is for aiming, lol. I dare suggest that Millie is not going to be shooting 15 yards in her home. Take any legal shotgun and shoot across a normal room distance, your pattern is not going to be more than an inch or two at the most.Actually you point a shotgun, most do not have rear sights just a bead. Shooting 3 gun has really helped my shotgun skills. Pump is not an issue and recoil on bird is not that much. If I am using a shotgun it is down the stairs and that is 15 yards probably. It has a fixed open choke barrel and the pattern at that distance is easily man sizedfor 7.5. With any home defense weapon you need to use it and know it. If it is a shotgun pattern it at the distance you will likely use it at.
Having said that, any long gun (including PCCs) can effectively be pointed without lining up sights at such short distance. The advantages I see of a PCC over a shotgun are muzzle blast, recoil, rate of fire, and magazine capacity. The shotgun only has one real advantage and that is the power of a single round. PCCs are also fun to shoot and are much more likely to be practiced with by people without a lot of shooting experience.