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Their more animal like, going to bathroom, needing to be fed, etc.
And since your partners always allow you around, it's easier to connect to them, and it feel rewarding to have a baby grow up to a armored samurai dragon, and then he dies.
having partner die makes the experience with your bro more real and and you'll start to miss them.
This what makes digimon world fun in my opinion, raising your digimon from a weakling into an unstoppable force, and the fact they can die, makes the time spent them more meaningful.
