I read fiction in sequential order, starting with the front cover and progressing page by page until I reach the back cover. Why not jump to random places in the book as we read, as we do with computer programs or mathematical proofs? Because fiction represents life, and life is lived in sequential order, each day following the previous one, starting with the day of our birth and progressing until the day of our death.
Computer games also force us to sequentially progress from level to level, and we usually cannot progress to the next level until we have succeeded in the current level. Why can we not skip ahead? Is it because they're supposed to model life?
In fact, in most computer games the character keeps getting stronger and stronger as they accumulate experience. Are there no computer games in which the character, after a certain point, starts diminishing in strength and has to practice compensating for decreased abilities? For example, if they have to throw some objects at a target, beyond some level, there might be some random perturbation that makes them shoot not so straight and miss the target with increased probability. I wonder how unpopular such a game might be.