"They will be flexible and inconsistent in doing their job" is the right answer.
According to Hamilton, the judiciary must be autonomous in order to achieve its main goal in a democratic government. It is vitally important in a democracy that individual magistrates and the judiciary as a body are impartial and autonomous of all outside pressures. As a result, the permanent position of the judges would be able to gain the confidence of people and society that their cases will be resolved impartially.