First of all, consorts are more trustworthy than relatives. Before the emperor came to power, he had a competitive relationship with other princes in the imperial clan. They generally have more or less secret encounters, so they don't trust them completely. A consort is either an uncle of her mother's family or her parents, brothers and sisters. They have been branded as emperors since they fought for the inheritance rights between princes. If the emperor did not succeed to the throne and other governors took the upper position, then they are likely to be dismissed from office or even die. Therefore, the emperor believes in consorts more rationally, and the relationship between the emperor and consorts is one glory and one loss. Generally speaking, they are in the same boat.
Secondly, consorts have no right to inherit the throne, so it is impossible to have such a big threat from relatives. The reason why consorts have today's status is because the emperor is in power, and the reason why people have a prominent position is really because of his surname. If the emperor falls, the consorts will bear the brunt, but the clan will bear the brunt of the benefits. In addition, if the clan holds real power, it may affect the power of the emperor, so the emperor prefers to reuse consorts.
Finally, the emperor reused consorts because of the balance in Emperor Wang Zhidao. Although the emperor is supreme, you are joking, but after the order is issued, it is not the emperor alone who needs specific implementation and supervision. Therefore, it is bound to reuse civil and military officials to supervise the implementation. So, how does the emperor control the situation at any time? If the emperor doesn't have a person he trusts to master the dynamics, he will become blind and will inevitably cheat the king. So the emperor must find someone he can trust to be his spokesman, and consorts are the best choice. Some people may ask, why not relatives? If you think about it carefully, you will understand that if you find a clan to be your spokesperson and the clan and the civil and military officials unite to rebel, then the emperor will be miserable.