That's pretty much my take as well.
For a target gun a single trigger works great, but in the field two triggers work better, especially when shots can vary in distance. There's nothing that comes close to two triggers for choosing the choke instantly, despite the supposed ability to choose the barrel with the safety (or whatever) on a single-trigger gun.
In my experience almost all hunters who use a single-trigger double never choose the barrel, so are essentially using them as 2-shot autoloader. They could just as well be using an autoloader, and have the advantage of a 3rd shot (and lighter recoil, in gas models).
