I too think that choice is the most important aspect that sets games apart from any other art form. And I think it’s exactly this aspect which non-gamers don’t understand. I remember a news report about „violent videogames“ after a school-shooting, where a scene from Hitman Contracts was shown in which the player was shooting the other patients/test-subjects. Then the moderator said „Pointless killing in the sanatorium is the goal of the game here.“
Of course that’s an insolent lie, but it also points out the misunderstanding many people have about games, namely that you don‘t have to do everything you can do.
Games give you – through their interactivity – the freedom to deviate from paths given to you by the designers. People, who are used to passively consume movies where your experience more or less stays the same no matter how often you watch it, seem to transfer this understanding to videogames and can’t understand that this freedom to choose your path, your narrative and your experience overall, are what makes games special and interesting.