^ All points I've considered as well when reaching my decision. I always assumed pump-action shotguns would be "ban proof" as well.
Not models like the Mossberg persuader, 590A1, Shockwave, etc, etc. Too many brands and models to list really. I remember the tube limit for the last proposed ban was like 5+1. I had a Persuader that held 7+1.
If you are in a shootout at handgun distance, expect misses.
I'd rather have the extra ammo for when that huge adrenaline dump settles down and you can actually work your way onto target.
Misses in such situations are unacceptable. If you can't hit the people shooting at you, don't pull the trigger. You could hit somebody else, and that comes with a crap-ton of legal, moral, and mental anguish. If someone's in a shootout, they don't have the luxury of waiting for an adrenaline dump to settle down. They'll be getting shot at. By the time anything settles down biologically, that person might (and probably would) be shot or dead already.
The goal should be to learn and train to fire accurately while under physical and mental pressure, not to still have enough ammo left after sending bullets where they shouldn't go, or waiting too long to defend one's self. If someone can't hit "center mass" at handgun distances, then they should be escaping, not risking the lives and safety of other innocent people.
Please understand that my reply to your comment was in no way personal. I'm merely discussing its subject matter.