It might be easier to explain if you consider that the AI lacks the fun factor that you can have with a friend, and since the game basically revolves
around the partner mechanic, it is not possible to avoid it either.
The game's Life
mechanic, which basically gives your
partners a limited and relatively brief life span, means your
partners will only be
around for a certain number of in - game days until they die and regenerate and start over as a brand new Digimon.