I don't think their issue is that they lack the actual story to tell. They simply lack the means to tell story in general (both the quality and quantity), so I can see why they did it tbh. It is kind of lame though that they can't do the few bits and pieces of a book ingame, I mean even the books only have a handfull of plot points. Surely there is some intern that could script it out to be shown ingame. But I also wouldn't be suprised if most of the books only exist because there was a mandate for x amount of cross media use of the franchse by some vaccuous twerp in a suit.