Sean,
It occurs that witht the "straightening" of shots with perimeter weighted irons, perhaps angles are coming back as more important than they have been in several decades, no? When you could curve the ball more, it was less hazardous to come from the wrong angle, IMHO.
Of course, the key is whether the contours on a narrow green accept or reject (i.e. fall away) from the improper angle approach. I tend to help the golfer, figuring distance control is tested well enough, by raising the contours to face the tough angle.