Cloffe, hunters are a conservative lot, even when they are Socialists, as I assume a few are in Scandinavia. When I was a kid in the Western US in the 1950s, a 30" barreled 12 guage with a full choke was considered THE all around weapon--hunters would use it for everything, and the more powerful the ammo, the better.
It was only after we became a little more cosmopolitan and started reading hunting and gun magazines that the Eastern/British heresies of shooting game on the wing became popular in the West, and with it smaller bores, lighter loads, and more open chokes.
In places where ammo is expensive (or people are poor), wing shooting itself is also just not considered reasonable (You might MISS!). In the 1950s in Baja California del Norte, Mexico, the first time I waited for a covey of quail to flush before shooting, my Mexican companeros shouted in frustration. They assumed I suffered from some disease of the reflexes or vision. Later they just assumed I was just "otro gringo loco"....
BTW, I've heard the same explanation you give above for tight Scandinavian chokes given for tight German chokes, except that hares were the main target, not roe deer.
I tried hunting pheasants with a nice AyA sixteen double that had been imported to the US from Sweden after having originally being sold by a large retailer in Northern Sweden. I either missed them clean or blew them to bits....inedible bits. More open chokes (cylinder and modified) fixed the problem.
