Ease of which I could move. It was rather refreshing to be able to just "bounce" around.
Great access. I set up the shot in my head, raised my iPhone, walked into a garage, took the shot, and left. No one even noticed me.
Most people tire of having a big black lump shoved in their faces. With the iPhone, you can get just as close but, again, people do not notice, in part because I think most folks have been conditioned to think of smartphones as a photographic tool.
Varied reactions. Some found my use of the iPhone amusing, while others took what I can only surmise was offense and actually tried to push me out of the way.