I think reliability and simplicity are other completely reasonable factors as well.
A single shot has so few moving parts that your chances of breaking something crucial to operation are at least somewhat minimized. They're basically just a barrel and a firing pin; with a simple method of manipulating that pin. It's also simple, to the point of being immediately obvious, to diagnose and repair should anything go wrong.
They are a cheap basic gun. If you have a break action 12 you can get adapters to fire 11 different calibers. It can be the perfect survival weapon, light weight and versatile. I got my son a break action .357 mag to train him how to shoot, the single shot, break action is IMO is the perfect platform to teach novice shooters the art of marksmanship.
I have 12 gauge in Semi auto, pump, double and single shot.. and by far my favorite is the single shot.
It weight almost nothing and is super fun to shoot. Using the same ammo it kick more than a Semi-auto or a pump auction. With heavy shot it can be brutal. So they may not be for the faint of hart.
I was just curious, I don't think one will make it into my personal gun cabinet as I have a 12 gauge pump and a 20 gauge double barrel which I think meet all of my personal shotgun needs...unless of course I happen to win a Remingtoon versa max at a gun raffle I am going to in the near future...
I am not a hunter my weapons/fire arms are for defense and target shooting and because I like them lol. I am saving up for a another weapon in the near future as per a post in another forum it will be a rifle that could potentially be used for deer hunting if I want to but will also be fun to target shoot with...I am interested in learning about and discussing all platforms...
I have a Winchester 20 ga. that was my very first gun. In October I will have owned it 50 years. Single shots are reliable, fun, effective hunting and target guns. Mine has taken numerous grouse squirrel, rabbit, crow, and one turkey. They are truly great, simple, reliable guns that last a lifetime.