The one thing to note here is that an iPhone doesn't have any UI to manually control settings a professional photographer might change like shutter speed, aperture and ISO. It only has a rudimentary interface to change the focus and most of the times I've seen people take photos won their iPhones, they rarely tap to set the focus and rely on the autofocus.
The iPhone camera is definitely not holding anyone back from shooting pictures of "professional photographer" quality and I for one am glad to see so many people have access to something that allows for great photos to be taken without needing to know anything and everything about how cameras work.