When designing something, especially a combat system, it's important to be consistent. By assuming that the story could be a game, I had to determine the power of various attacks and the health of everyone. I was able to determine the rules and this made combat consistent.
Games also allow for more avenues in storytelling because it can make even tedious tasks boring. We might not care to watch help missions in a TV show, but in video games, they are fine and therefore provide plenty of opportunities to expand the world.
Another benefit is the choice system. Even though most video games are linear in their stories, the ability to show different outcomes is amazing. For example, what if David made a different choice in Episode 12? In a movie or TV show, unless time travel is a plot point, this cannot be done often. In video games, this can be done and fully explored if the developers are willing to take up the task.
So are video games the best storytelling format? Maybe for some stories, like what I've heard for Rachet and Clank, but not all. I just wanted to convey that it is a legitimate medium that has its advantages. Would Shining be a good video game? There are things I would like to do if it was, but I think it wouldn't be as enjoyable as a comic/manga. In addition, the novel format also has its advantages, but that's for another time.
J. D. Nyle