Don't have a smartphone and my iPad is incompatible with the app. ( iPad gen 1 owner here )
I do have two other PSN accounts but I forgot the passwords to those accounts and the emails associated with them.
Not to mention the share button is just not fast enough to capture that split second moments where cool action happens. This way the game is frozen immediately at the push of a toggle in-game. Then you can manipulate the camera angle/DoF before pressing the share button. IT'S GENIUS! And provides free promotion for the game too.