The one thing that I see here, especially from those who dont think DA is viable, is the focus on "the trigger", and what the trigger is and does.One thing NOT mentioned is the GUN being used. Every DA gun you pick up does NOT have a wonderful sweet smooth and (relatively) light trigger. Some are excellent, most are good/fair, a few are horrid. I have a DA revolver with a pull that is somewhere above the 20LBS my scale can measure. I doubt even a DA expert would do his best work with a gun like that. Same gun, SA pull is about 5lbs, and I can manage that well enough.
I think thats the issue, and its misdirected focus. If you put the focus on what is going to place the bullet, and maintain that focus, until the shot breaks, the trigger becomes a lot less of an issue. Once you get over worrying about the trigger, things become so much easier.
Since SA seems to be so popular, the one thing that bugs me the most about them is, the "lock lag" in the hammer drop on the SAO guns. That to me, is much more annoying than the triggers, and is very much like the bolt going forward on a open bolt SMG. Luckily, Ive got the focus thing down, and I can get over it.