Quick Transmigration: The Host Is No Foolish Sweetheart

To complete the tasks assigned by the System, Su Yu must transmigrate to different worlds and help each Host escape their predicament and turn their lives around. A pitiful concubine-born daughter, abused and scolded since childhood, then forced to die as a burial sacrifice... A farm girl unloved by her grandparents, exploited by her uncles and aunts, and bullied by her cousins... A bandit's daughter sent to bring good fortune to a sickly young master... The descendant of a notorious female demon in the martial world... A vicious heiress famous for her spoiled, overbearing ways... The least talented female disciple of the Demon-Slaying Palace...

Could someone explain why all her Hosts have such weak character setups? The System says, “If nobody had problems, what would we need you for?”