I find the subjects of point shooting, shooting from the hip, and PGO shotguns to be facinating!
I see them all as things that may not be optimal, but that doesn't mean they are without worth. Specifically, with regard for shooting from the hip, I have a hard time thinking of a situation when that would be necessary. Maybe if there was some obstacle that prevented me from shouldering the gun, or my left arm was injured and I was resting the forearm on a chair or table, but I don't really see it being super useful all that often. Even so, I can't think of a single reason why one shouldn't practice it.
I don't think its any big surprise that shouldering a firearm with a stock is going to give you the best results, but if you don't always need to shoulder it, more power to you!
In an emergency, you have to do what you have to do.
Agreed, BUT I would also argue that "If you don't have time to do it right the first time, you sure as hell aren't going to have enough time to do it right the second time." Granted, it's all situation dependent, but for the most part, I'd be more inclined to get the weapon shouldered and the sights on target so that if you do only have time for one shot, you can make that one shot count. I guess the point I'm trying to make is that it's a good skill to have, BUT I wouldn't put it as my first priority when it comes to my practice and training.