Some players don't like to 'micro- manage' other party members. Atleast for 'origin' characters give the option for them to auto choose how they upgrade each level.
Iike in DOS2 having the option of playing as different origin characters is fantastic and adds replayability.
Purely optional, but some would like to have the other characters in your party attack controlled by the computer.
Extra campanions, animals/summons etc, is part of DnD so should be present.
