That's why I said camera shake isn't a given. Those photos weren't taken on a tripod so the user must've had pretty stable hands. It's just as much of a subjective feature as landscape mode. All users, on the other hand, can benefit from bigger screen (although at the expense of portability) and longer battery life.
I suppose, though judging by the large volume of posts by people saying they prefer the screen size of the 5 series over the 6 I'd say that just about any feature can be said to be subjective to the end user's preferences and needs. My point is that OIS is not a trivial addition to the device, especially to people like me who are photographers and who use lots of different cameras, including the iPhone in a pinch and want that extra stop or two when it means either getting the shot or getting nothing.